Teaching Pack

Statistics
Cambridge IGCSETM
Mathematics 0580
This Teaching Pack can also be used with the following syllabuses:
• Cambridge IGCSE™ (9–1) Mathematics 0626
• Cambridge IGCSE™ (9–1) Mathematics 0980
• Cambridge IGCSE™ International Mathematics 0607
• Cambridge O Level Mathematics 4024

Version 1
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Contents
Contents ............................................................................................................................................................ 3
Introduction ...................................................................................................................................................... 5
Skill: Statistics ................................................................................................................................................... 6
Lesson 1: Predicting trends, considering data models ..................................................................................... 9
and effective questioning ................................................................................................................................... 9
Lesson 1: Continued....................................................................................................................................... 10
Lesson 2: Bar charts and histograms ............................................................................................................. 12
Lesson 2: Continued....................................................................................................................................... 13
Lesson 3: Representations, restrictions and .................................................................................................. 14
relationships between data .............................................................................................................................. 14
Lesson 4: Cumulative frequency and box-and- .............................................................................................. 15
whisker plots .................................................................................................................................................... 15
Worksheets and answers ................................................................................................................................ 16
Worksheet 1a: Scatter diagram ...................................................................................................................... 17
Worksheet 1b: 2D and 3D pie charts ............................................................................................................. 18
Worksheet 1b: continued ............................................................................................................................... 19
Worksheet 1b: continued ............................................................................................................................... 20
Worksheet 1b: continued ............................................................................................................................... 21
Worksheet 3a: Stem-and-leaf practice ........................................................................................................... 22
Worksheet 3a: continued................................................................................................................................ 23
Worksheet 3b: IQR and Pictogram ................................................................................................................ 24
Worksheet 3b: continued ............................................................................................................................... 25
Worksheet 3b: continued ............................................................................................................................... 26
Worksheet 4a: Hint and next steps cards ...................................................................................................... 27
Worksheet 4b: Cumulative frequency and box-and-whisker plots ................................................................. 28
Worksheet 4b: Continued............................................................................................................................... 29
Worksheet 1a: Answers ................................................................................................................................. 30
Worksheet 1b: Answers ................................................................................................................................. 31
Worksheet 1b: Answers ................................................................................................................................. 32
Worksheet 1b: Answers ................................................................................................................................. 33
Worksheet 1b: Answers ................................................................................................................................. 34
Worksheet 3b: Answers ................................................................................................................................. 35
Worksheet 3b: Answers ................................................................................................................................. 36
Worksheet 3b: Answers ................................................................................................................................. 37
Worksheet 4a: Answers ................................................................................................................................. 38
Worksheet 4b: Answers ................................................................................................................................. 39
Worksheet 4b: Answers ................................................................................................................................. 40
Icons used in this pack:

Lesson

Video

Assessment opportunity
Introduction
This pack will help you to develop your learners’ mathematical skills as defined by assessment
objective 1 (AO1 Demonstrate knowledge and understanding of mathematical techniques) in the
course syllabus.

Important note
Our Teaching Packs have been written by classroom teachers to help you deliver
topics and skills that can be challenging. Use these materials to supplement your
teaching and engage your learners. You can also use them to help you create
lesson plans for other skills.

This content is designed to give you and your learners the chance to explore mathematical
skills. It is not intended as specific practice for exam papers.

This is one of a range of Teaching Packs. Each pack is based on one mathematical topic with a
focus on specific mathematical techniques. The packs can be used in any order to suit your
teaching sequence.

In this pack you will find the lesson plans and worksheets for learners you will need to successfully
complete the teaching of this mathematical skill.
Teaching Pack: Statistics

Skill: Statistics
This Teaching Pack links to the following syllabus content (see syllabus for detail):

• C9.1 – C9.8
• E9.1 – E9.8

The pack covers the following mathematical skills, adapted from AO1: Demonstrate
knowledge and understanding of mathematical techniques (see syllabus for assessment
objectives):

• Collecting and collating data

• Drawing and interpreting graphs
• Drawing and interpreting statistical diagrams including (but not limited to) frequency tables,
bar charts, histograms, pie charts, scatter graphs, box-and-whisker plots, pictograms, stem-
and-leaf diagrams and back-to-back stem-and-leaf diagrams
• Calculating and interpreting mean, median, mode, range, interquartile range, outliers and
the line of best fit

Prior knowledge

Knowledge from the following syllabus topics is useful.

• C1.8 Use the four rules for calculations with whole numbers, decimals and vulgar (and
mixed) fractions, including correct ordering of operations and use of brackets.
• C1.12 Calculate a given percentage of a quantity. Express one quantity as a percentage
of another. Calculate percentage increase or decrease.
• E1.12 Carry out calculations involving reverse percentages, e.g. finding the cost price
given the selling price and the percentage profit.
• C1.13 Use a calculator efficiently. Apply appropriate checks of accuracy.
• C2.10 Interpret and use graphs in practical situations including travel graphs and
conversion graphs. Draw graphs from given data.
• C3.1 Demonstrate familiarity with Cartesian coordinates in two dimensions.
• C3.2 Find the gradient of a straight line
• C4.2 Measure and draw lines and angles.
• C4.3 Read and make scale drawings.
• C8.4 Expected frequency of occurrences

6 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Going forward

The knowledge and skills gained from this Teaching Pack can be used for when you teach learners
about Probability.

• C8.4 Understand relative frequency as an estimate of probability.

Before you begin

This Teaching Pack includes a Teacher Introduction video to which you should refer
before using the resources in this pack. The video is available to watch in Resource Plus
within the topic section relevant to this Teaching Pack.

The video introduces the resources available for teaching this topic, and explains how they can be
used to successfully deliver the topic to your learners. In particular, the video highlights typical
learner misconceptions and common errors this Teaching Pack will help you to overcome.

Cambridge IGCSE Mathematics (0580) 7

Teaching Pack: Statistics

Common misconceptions: Statistics

There is often confusion about the relationship between correlation and gradient. Learners can
compartmentalise the different strands of mathematics, which prevents them making links between
different mathematical elements. In lesson three we explore positive and negative correlation and
whether the line of best fit is positive of negative. This should allow learners to make connections
with their prior knowledge.

Learners may also struggle with data representations that they are not familiar with. For example,
learners can find it difficult to grasp concepts such as back-to-back stem and leaf diagrams, 3D pie
charts and plotting median. This Teaching Pack offers learners the opportunity to gain a better
understanding of these topics.

An obstacle often faced by learners in statistics is the language used. Understanding specific
mathematical vocabulary will help learners to successfully access the curriculum. In lesson two
learners will play a game, which encourages them to not only reflect on what vocabulary they are
comfortable with, but to engage with language that may be new to them.

8 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Lesson 1: Predicting trends, considering data models

and effective questioning

Resources • Whiteboard
• Lesson 1 Presentation
• Worksheet 1a and Worksheet 1b

Learning By the end of the lesson:

objectives • all learners should be able to draw and read a 2D pie chart
• most learners should be able to estimate values from a scatter
diagram using the line of best fit
• some learners will be able to debate the pros and cons of using
2D and 3D pie charts

Timings Activity
Starter / Introduction
Give learners Worksheet 1a as they come into the classroom. They should discuss
the scatter diagram in pairs.

Once they have had time to have a look, develop a classroom discussion about the
information. For example, you could ask: What happened in April? Why could this
be? (There was a high amount of rainfall in March). Which month had the highest
amount of rainfall? (December, month 12).

Following this, ask your learners to draw the line of best fit on their scatter diagram
and use this information to predict how much rainfall would occur in January 2018
(month 13). The result of this is shown on the PowerPoint.

Main lesson
Ask learners to consider what they were doing when they drew their line of best fit.

Following this, discuss how predictions are used in statistics. Ask learners where
they have seen predictions previously and add these to the mind map on the slide.
You should explain that statistics is the analysis of data, which can then be used to
predict future trends.

Having addressed what statistics is and its relationship with predictions, ask
learners what data representations they know.

Ask your learners to rank the expenditures on the pie chart from 1 (highest
percentage) to 6 (lowest percentage). When they have finished, reveal the
percentages. Ask them to discuss the advantages / disadvantages of using 3D pie
charts to represent data.

Go through an example of drawing and reading a pie chart before setting learners
Worksheet 1b.

Cambridge IGCSE Mathematics (0580) 9

Teaching Pack: Statistics

Lesson 1: Continued

Plenary
As learners continue working on Worksheet 1B, introduce the homework task. It is
important to ensure that learners have a few minutes to consider what they will ask
and what makes a good question before the lesson ends.

They will need to bring their completed homework to the next lesson, as they will
need to use it.

10 Cambridge IGCSE Mathematics (0580)

Teaching Pack: Statistics

Lesson 2: Bar charts and histograms

Resources • Whiteboard
• Lesson 2 Presentation

Learning By the end of the lesson:

objectives • all learners should know the difference between a bar chart and a
histogram
• most learners should be able to solve mean, median, mode and
range questions in a logical order
• some learners will be able to define statistical vocabulary

Timings Activity
Starter / Introduction
Feedback from homework task. Learners will ask their partner the questions they
have written for their two questionnaires. They should offer each other feedback
about what questions worked or didn’t work and why.

Main lesson
Learners will play a game of which tests their statistical vocabulary and tackling any
misconceptions they may have of certain definitions. One learner should stand
facing the front of the class so they do not see the word that appears behind them.
Show the rest of the class the word – their job is to get the learner at the front to
guess the word by describing it, without using the word itself.
Decide with your class how long each learner will have on a definition and how they
can score points. Will it be in pairs? In tables? In groups? Individually?
Possible answers / definitions are in the notes of each slide. The first one which is
‘questionnaire’ should be used as a demonstration.

Having addressed these definitions, you should recap mean, median, mode and
range.

Following the recap, learners should explore these concepts further by considering
the following question as a class:

There are five positive whole numbers that have a mean of 4, a median
of 3 and a mode of 3. What could these numbers be?

Some solutions are:

1) 1, 2, 3, 3, 11
2) 1, 3, 3, 5, 8
3) 2, 3, 3, 3, 9

You could ask the class if there are any rules that can be followed to help solve this
problem. For example, the third number will always be 3 with smaller and larger
numbers either side as it is the median. As an extension you could ask the class
how the question would change if the range was added in (for example, a range of
7).

12 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Lesson 2: Continued

Learners will then embark on some arithmetic questions challenging their

understanding of these words.

Ask your learners what the differences are between bar charts and histograms. You
can record their ideas on the slide as a mind map. The obvious differences are that
bar charts have spaces with equally wide bars and are usually used for qualitative
and / or discrete data; and histograms do not have spaces, may have unequal bars
and are usually used for quantitative and / or grouped data.

The main idea that learners should understand is that histograms display
continuous data, or numbers between intervals.

Learners will engage in another game ‘name that chart!’ tackling their
understanding of what these data representations look like.
Plenary
A graph of names of children and their height will be displayed and learners will be
asked how to improve this chart. It is discrete data, which means a bar chart should
be used but there are no spaces between the bars.

Learners should be reminded of their homework.

Cambridge IGCSE Mathematics (0580) 13

Teaching Pack: Statistics

Lesson 3: Representations, restrictions and

relationships between data

Resources • Whiteboard
• Lesson 3 Presentation
• Worksheet 3a and Worksheet 3b

Learning By the end of the lesson:

objectives • all learners should understand what makes certain data
representations appropriate for certain sets of data
• most learners should be able to calculate the median, mode and
range of stem-and-leaf diagrams
• some learners will be able to solve IQR questions

Timings Activity
Starter / Introduction
Learners need to work in pairs and share their data presentations from their
questionnaires. They could use the questions on the slide to help critique each
other’s work.

Main lesson
Following on from their work in pairs, use the large versions of each of the
questions to have a class discussion about the two sets of data. Discuss what
learners had to say about each other’s work and consider what makes a good
representation and what restrictions might occur when collecting data.

Start a discussion on correlation by showing the ‘spot the difference’ slide and
encouraging learners to think about the gradients and the effects these have on the
lines. Following on from this, show your learners the scatter diagrams and ask them
to describe the correlation types shown.

Another way of showing related values is to use a stem-and-leaf diagram. Ask

learners to recall what one of these looks like before revealing the one shown on
the slide. Use the following slides to recap how we extract statistical data from
stem-and-leaf diagrams. Once you have done this, give learners Worksheet 3a so
they can check their understanding. The answers are shown on the following slides.
Finding the range should be completed without a calculator.

Discuss what the letters IQR stand for and what they mean.

Plenary
Having reminded learners what IQR means, work as a class to complete the IGCSE
question on IQR.

Finally ask learners to complete Worksheet 3b for homework.

14 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Lesson 4: Cumulative frequency and box-and-

whisker plots

Resources • Whiteboard
• Lesson 4 Presentation
• Worksheet 4a and Worksheet 4b

Learning By the end of the lesson:

objectives • all learners should understand what cumulative frequency is and
how to answer questions on it
• most learners should be able to get the mean of a frequency
table

Timings Activity
Starter / Introduction
Ask your learners to consider the implications of using an unequal histogram.

Main lesson
In groups, learners should discuss how to calculate the mean from a frequency
table. After a few minutes, you could pass out either the Hint or Next Steps card
from Worksheet 4a to each group depending on how they are progressing. The
answers are shown on the following two slides which you can discuss with your
class as they check their understanding.

Learners will then engage in a game of true/false wherein they will explore
cumulative frequency and how to approach questions on this topic. The answers for
each are shown in the notes section at the bottom of each slide.

Go through the example displaying a cumulative frequency table and graph.

Remind your learners about box-and-whisker plots and show the solved question.
You could ask you learners what the different parts of this graph mean and how
they relate to the table of values given.

Plenary
Learners can complete the questions on the slide on box-and-whisker plots before
being set the homework on Worksheet 4b.

Cambridge IGCSE Mathematics (0580) 15

Teaching Pack: Statistics

Worksheets and answers

Worksheets Answers

For use in Lesson 1:

1a: Scatter Diagram Starter 15 28

1b: 2D and 3D Pie Charts 16-19 29-32

For use in Lesson 3:

3a: Stem-and-leaf practice 20-21 -

3b: IQR and Pictogram 22-24 33-35

For use in Lesson 4:

4a: Hint and Next Steps Cards 25 36

4b: Cumulative frequency and box-and-whisker plots 26-27 37-38

16 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 1a: Scatter diagram

Look at the scatter diagram and discuss with your partner what the data shows.

Total rainfall in 2017 (mm)

180

160

140

120
Rainfall (mm)

100

80

60

40

20

0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Months of the year

Cambridge IGCSE Mathematics (0580) 17

Teaching Pack: Statistics

Worksheet 1b: 2D and 3D pie charts

1. Learners were asked how they travelled to school. The results are shown on the pie chart
below.

a) How did most of the learners travel to school?

................................................................................

b) 24 learners were asked.

Work out the number of learners who cycled to
school.

2. Sara recorded the musical instrument played by each of 30 learners in the school band.
The table shows her results. Complete the pie chart to display this data.

Trumpet 12
Flute 5
Drums 1
Oboe 7
Saxophone 5

18 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 1b: continued

3. The pie charts show some information about the numbers of medals won by two countries
at an athletics event.

Medals won by Country A Medas won by Country B

Bronze, Gold,
Bronze, Gold, 72
120 120
120

Silver, Silver,
156 168

a. Draw 2D pie charts of this data. Give two reasons that explain why using 2D pie
charts are better to present this data.

Reason 1:
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

Reason 2:
…………………………………………………………………………………………………
…………………………………………………………………………………………………
………………………………………………………………………………………………

Cambridge IGCSE Mathematics (0580) 19

Teaching Pack: Statistics

Worksheet 1b: continued

b. Country A won 7 bronze medals. How many gold medals did they win?

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

c. Josh says, ‘The pie charts show that Country A won more gold medals than Country
B’. Is Josh right? You must explain your answer.

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

4. Some children were asked to name their favourite flavour of ice cream. Use the pie chart
and information in the table to complete the missing sections.

Flavour Number of children Angle of sector

Vanilla 12 90°

Mint 45°

Strawberry 14

Chocolate 120°

20 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 1b: continued

5. The pie chart below shows the percentages of hair colour for a group of 200 people.

Hair colour for a group of 200 people

Red
Blond
16%
19%

Black
25%
Brown
40%

a. How many people in this group have blond hair?

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
b. How many people in this group do not have brown hair?
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

c. How many people in this group have red or black hair?

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

Cambridge IGCSE Mathematics (0580) 21

Teaching Pack: Statistics

Worksheet 3a: Stem-and-leaf practice

1. Manjit counted the number of letters in each of 30 sentences in the school newsletter. She
showed her results in a stem-and-leaf diagram.

0 8 8 9

1 1 2 3 4 4 8 9

2 0 3 5 5 7 7 8

3 2 2 3 3 6 6 8 8

4 1 2 3 3 5

Key 4 │ 1 stands for 41 letters

a. Write down the number of sentences with 36 letters

…………………………………………………………………………………………………
b. Work out the range
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

Manjit says “To find the median, you add all the results and divide by 15.”

c. Manjit is wrong. Explain how to find the median

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

d. Work out the median

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

22 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 3a: continued

2. A stem-and-leaf diagram has been drawn for a number of people entering a shop over a
number of days.

0 1 2 8 9

1 3 3 5 7 7 7 9

2 0 1 4 8 9

3 0

Key: 1 │ 3 means 13

a. How many days did the people get counted?

…………………………………………………………………………………………………
…………………………………………………………………………………………………

b. What is the modal number of people entering the shop?

…………………………………………………………………………………………………
…………………………………………………………………………………………………

c. Find the median number of people entering the shop?

…………………………………………………………………………………………………
…………………………………………………………………………………………………

Cambridge IGCSE Mathematics (0580) 23

Teaching Pack: Statistics

Worksheet 3b: IQR and Pictogram

1. Mateo records the distance a ball dropped from a fixed height bounced.

61, 48, 58, 35, 45, 72, 36, 56, 47, 58, 60, 59, 43, 38, 41, 67, 63, 54, 45, 39

For Mateo’s results find:

a. The median
…………………………………………………………………………………………………
…………………………………………………………………………………………………

b. The range
…………………………………………………………………………………………………
…………………………………………………………………………………………………

2. Fatima records the distance a second ball dropped from a fixed height bounced.

58, 63, 38, 56, 41, 49, 52, 39, 73, 42, 58, 62, 75, 65, 38, 49, 51, 60, 63, 55

a. Put the information into a stem-and-leaf diagram, including the data from Mateo
too.

For Fatima’s results, find

b. The median
…………………………………………………………………………………………………
…………………………………………………………………………………………………

c. The interquartile range

…………………………………………………………………………………………………
…………………………………………………………………………………………………

24 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 3b: continued

3. Work out the median and interquartile range of each of the following sets of data showing clearly all
the steps in your working.

a. 3, 9, 12, 15, 16, 18, 21

b. 152, 167, 159, 162, 140, 157, 163, 160, 155, 141, 158

c. 1.4, 2.7, 0.2, 3.5, 4.1, 2.3, 1.9, 2.2, 1.6, 2.0, 1.6, 2.6, 2.2, 1.8, 2.9, 3.0

d. 19, 11, 5, 16, 21, 16, 9, 13

e. 62, 51, 48, 55, 56, 43, 59, 48, 57, 60, 47, 55

…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………

Cambridge IGCSE Mathematics (0580) 25

Teaching Pack: Statistics

Worksheet 3b: continued

4. Draw a pictogram of your typical weekday (see the images below for some ideas of the
pictures you could use).
Time

Activities

Sleep School Travel Online Shopping Washing Eating

26 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 4a: Hint and next steps cards

Hint Card

3 cars passing occurred 5 times, therefore there

were 15 cars in total.
How many times did 4 cars passing occur?

Next Steps Card

Find the mean of the following:

Cars passing 3 4 5 6

Frequency 5 10 28 36

? 15

Cambridge IGCSE Mathematics (0580) 27

Teaching Pack: Statistics

Worksheet 4b: Cumulative frequency and box-and-whisker

plots

1) The times, in seconds, taken by 11 learners to finish a race are listed in order.

4, 12, 13, 17, 18, 20, 22, 24, 25, 30, 34

Draw a box-and-whisker plot for this data

0 10 20 30 40

2) This frequency table gives information about the ages of 60 office workers.

a. Complete the cumulative frequency column

Age (A) in years Frequency Cumulative frequency

20 < A ≤ 30 12

30 < A ≤ 40 15

40 < A ≤ 50 18

50 < A ≤ 60 12

60 < A ≤ 70 3

28 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 4b: Continued

b. On the grid below, draw a cumulative frequency graph for this information.

c. Use your cumulative frequency graph to find an estimate for the median age.

…………………………… years

d. Use your cumulative frequency graph to find an estimate for the number of workers
older than 55 years.

…………………………… workers over 55 years of age

70

60

50
Cumulative frequency

40

30

20

10

0
20 30 40 50 60 70 80
Age (A) in years

Cambridge IGCSE Mathematics (0580) 29

Teaching Pack: Statistics

Worksheet 1a: Answers

Learners should have drawn a line of best fit that resembles the one below. Their drawing should:
a) be drawn with a pencil and ruler
b) exclude the outlier
c) have an approximately even amount of data on each side
d) go beyond the scale drawn, to show that month 13 has rainfall exceeding 160mm

Total rainfall in 2017 (mm)

180

160

140

120
Rainfall (mm)

100

80

60

40

20

0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Months of the year

30 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 1b: Answers

1. Learners were asked how they travelled to school. The results are shown on the pie chart
below.

a) How did most of the learners travel to school?

Walk

b) 24 learners were asked.

Work out the number of learners who cycled to
school.

24 ÷ 4 = 6

2. Sara recorded the musical instrument played by each of 30 learners in the school band.
The table shows her results. Complete the pie chart to display this data.

Instruments played by learners in

Trumpet 12 12
×360=144° the band
30
Flute 5 5
×360=60°
30
Drums 1 1
×360=12° Saxopho
30
ne
Oboe 7 7 17% Trumpet
×360=84°
30 40%
5 Oboe
Saxophone 5 ×360=60° 23%
30

Flute
17%
Drums
3%

Cambridge IGCSE Mathematics (0580) 31

Teaching Pack: Statistics

Worksheet 1b: Answers

3. The pie charts show some information about the numbers of medals won by two countries
at an athletics event.

Medals won by Country A Medas won by Country B

Bronze, Gold, Gold,

Bronze,
120° 120° 72°
120°

Silver, Silver,
156° 168°

a. Draw 2D pie charts of this data. Give two reasons that explain why using 2D pie
charts are better to present this data.
Medals won by Country A Medals won by Country B

Gold, 72°
Bronze, Gold, Bronze,
120° 120° 120°

Silver, Silver,
156° 168°

Reason 1:

It is easier to read the data from a 2D pie chart

Reason 2:

The 2D pie charts make it clearer that both teams won the same

number of bronze medals

32 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 1b: Answers

b. If Country A won 7 bronze medals, how many gold medals did they win?

120° = 7 medals, so 360° = 21 medals in total.

21
1° =
360

21
therefore, 156° = × 156 = 9.1, but as you cannot round medals up,
360
Country A won 9 silver medals

c. Josh says, ‘The pie charts show that Country A won more gold medals than Country
B’. Is Josh right? You must explain your answer.

We can’t be sure as we don’t know how many medals in total Country B

won.

4. Some children were asked to name their favourite flavour of ice cream. Use the pie chart
and information in the table to complete the missing sections.

Flavour Number of children Angle of sector

Vanilla 12 90°

Mint 6 45°

Strawberry 14 105°

Chocolate 16 120°

Cambridge IGCSE Mathematics (0580) 33

Teaching Pack: Statistics

Worksheet 1b: Answers

5. The pie chart below shows the percentages of hair colour for a group of 200 people.

Hair colour for a group of 200 people

Red
Blond
16%
19%

Black
25%
Brown
40%

a. How many people in this group have blond hair?

16% of 200 people = 32 people

b. How many people in this group do not have brown hair?

40% of 200 people = 80 have brown hair

Therefore, 200 – 80 = 120 people do not have brown hair

c. How many people in this group have red or black hair?

16% of 200 = 32 red

25% of 200 = 50 black

Therefore, 32 + 50 = 82 have red or black hair

34 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 3b: Answers

1. Mateo records the distance a ball dropped from a fixed height bounced.

35, 36, 38, 39, 41, 43, 45, 45, 47, 48, 54, 56, 58, 58, 59, 60, 61, 63, 67, 72

For Mateo’s results find:

a. The median

48 + 54 = 102

102 ÷ 2 = 51

b. The range

72 – 35 = 37

2. Fatima records the distance a second ball dropped from a fixed height bounced.

38, 38, 39, 41, 42, 49, 49, 51, 52, 55, 56, 58, 58, 60, 62, 63, 63, 65, 73, 75

a. Put the information into a stem-and-leaf diagram, including the data from Mateo
too.

Fatima Mateo

9 8 8 3 5 6 8 9

9 9 2 1 4 1 3 5 5 7 8

8 8 6 5 2 1 5 4 6 8 8 9

5 3 3 2 0 6 0 1 3 7

5 3 7 2

Key 8 │ 3 = 38
4 │ 1 = 41

b. 55 + 56 = 111
111 ÷ 2 = 55.5
c. UQ = 62 + 63 = 125 ÷ 2 = 62.5
LQ = 42 + 49 = 91 ÷ 2 = 45.5
IQR = UQ – LQ = 17

Cambridge IGCSE Mathematics (0580) 35

Teaching Pack: Statistics

Worksheet 3b: Answers

3. Work out the median and interquartile range of each of the following sets of data showing
clearly all the steps in your working.
a. Median = 15
UQ = 18
LQ = 9
IQR = UQ – LQ = 18 – 9 = 9

b. 140, 141, 152, 155, 157, 158, 159, 160, 162, 163, 167
Median = 158
UQ = 162
LQ = 152
IQR = UQ – LQ = 162 – 152 = 10

c. 0.2, 1.4, 1.6, 1.6, 1.8, 1.9, 2.0, 2.2, 2.2, 2.3, 2.6, 2.7, 2.9, 3.0,
3.5, 4.1
Median = 2.2 + 2.2 = 4.4 ÷ 2 = 2.2
UQ = 2.7 + 2.9 = 5.6 ÷ 2 = 2.8
LQ = 1.6 + 1.8 = 3.4 ÷ 2 = 1.7
IQR = UQ – LQ = 2.8 – 1.7 = 1.1

d. 5, 9, 11, 13, 16, 16, 19, 21

Median = 13 + 16 = 29 ÷ 2 = 14.5
UQ = 16 + 19 = 35 ÷ 2 = 17.5
LQ = 9 + 11 = 20 ÷ 2 = 10
IQR = UQ – LQ = 17.5 – 10 = 7.5

e. 43, 47, 48, 48, 51, 55, 55, 56, 57, 59, 60, 62
Median = 55 + 55 = 110 ÷ 2 = 55
UQ = 57 + 59 = 116 ÷ 2 = 58
LQ = 48 + 48 = 96 ÷ 2 = 48
IQR = UQ – LQ = 58 – 48 = 10

36 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 3b: Answers

4. Draw a pictogram of your typical weekday.

This diagram is just a suggestion.

24:00

23:00

22:00

21:00

20:00

19:00

18:00

17:00
Time

16:00

15:00

14:00

13:00

12:00

11:00

10:00

09:00

08:00

Activities

Key:

Sleep School Travel Online Washing Eating

Cambridge IGCSE Mathematics (0580) 37

Teaching Pack: Statistics

Worksheet 4a: Answers

Hint Card

3 cars passing occurred 5 times, therefore there

were 15 cars in total.
How many times did 4 cars pass?
10 times, thus 40 cars passing in total

Next Steps Card

Find the mean of the following:

Cars passing 3 4 5 6

Frequency 5 10 28 36

Total? 15 50 140 216

K
15+40+140+216 137
=
7+10+28+36 27

38 Cambridge IGCSE Mathematics (0580)

 Teaching Pack: Statistics

Worksheet 4b: Answers

1) The times, in seconds, taken by 11 learners to finish a race are listed in order.

4, 12, 13, 17, 18, 20, 22, 24, 25, 30, 34

Draw a box-and-whisker plot for this data

0 10 20 30 40

2) This frequency table gives information about the ages of 60 office workers.

a. Complete the cumulative frequency column

Age (A) in years Frequency Cumulative frequency

20 < A ≤ 30 12 12

30 < A ≤ 40 15 27

40 < A ≤ 50 18 45

50 < A ≤ 60 12 57

60 < A ≤ 70 3 60

Cambridge IGCSE Mathematics (0580) 39

Teaching Pack: Statistics

Worksheet 4b: Answers

b. On the grid below, draw a cumulative frequency graph for this information.

c. Use your cumulative frequency graph to find an estimate for the median age.

42 years

d. Use your cumulative frequency graph to find an estimate for the number of workers
older than 55 years.

52 workers are less than 55 years old so:

60 – 52 = 8 workers over 55 years of age

70

60

50
Cumulative frequency

40

Median
30

20

10

0
20 30 40 50 60 70 80
Age (A) in years

40 Cambridge IGCSE Mathematics (0580)

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