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1/4 Probability of Landing On Red?

The document provides examples of calculating simple probability for different scenarios. It gives the probability of different spinners landing on red and the probability of choosing specific chocolates or cards from mixed sets. The key is identifying the number of favorable outcomes and total possible outcomes to determine the probability as a fraction or percentage.

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Isaque Silva
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46 views6 pages

1/4 Probability of Landing On Red?

The document provides examples of calculating simple probability for different scenarios. It gives the probability of different spinners landing on red and the probability of choosing specific chocolates or cards from mixed sets. The key is identifying the number of favorable outcomes and total possible outcomes to determine the probability as a fraction or percentage.

Uploaded by

Isaque Silva
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Topic: Simple probability

Question: Which spinner has a 1/4 probability of landing on red?

Answer choices:

A B C

D All of the spinners have a 1/4 probability of landing on red.

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Solution: D

To find the probability of the octagon spinner landing on red, consider


that the triangles are the same size and shape. This means there are 2 out
of 8 total ways to land on red.

2 1
P(red) = =
8 4

To find the probability of the circle spinner landing on red, consider that
the red parts each make up 1/8 of the circle, since they are half of a
quarter of the circle. We have 2 of them, so

2 1
P(red) = =
8 4

To find the probability of the square spinner landing on red, consider that
it’s divided into 4 equal triangles, one of which is red.

1
P(red) =
4

110
Topic: Simple probability

Question: Brett bought a box of chocolates. 2 of them are coconut, 3 are


orange, 4 are caramels, and 1 is raspberry. All of the chocolates look the
same. What’s the probability that Brett chooses a coconut chocolate?

Answer choices:

A 20 %

B 30 %

C 50 %

D 60 %

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Solution: A

To answer the question, use the definition of simple probability.

outcomes that meet our criteria


P(event) =
all possible outcomes

In this case, the outcomes that meet our criteria are the 2 coconut
chocolates. All possible outcomes can be found by found by adding all of
the types together.

2 + 3 + 4 + 1 = 10

Therefore, the probability of choosing a coconut chocolate is

2 1
P(coconut) = = = 0.2 = 20 %
10 5

112
Topic: Simple probability

Question: Linel is playing the game Go Fish with her daughter Leah. She
needs a picture of a blue whale to win the game. In the pile there are 4
whales, 6 tuna fish, 1 dolphin, and 3 mackerel. To the nearest percent, what
is the probability that she draws a whale and wins the game?

Answer choices:

A 7%

B 18 %

C 35 %

D 29 %

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Solution: D

Remember the definition of simple probability.

outcomes that meet our criteria


P(event) =
all possible outcomes

In this case, the outcomes that meet our criteria are the 4 whales. All
possible outcomes can be found by adding all of the types of cards in the
deck together:

4 + 6 + 1 + 3 = 14

Therefore, the probability of pulling a whale from the deck is

4
P(whale) = ≈ 0.29 ≈ 29 %
14

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