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SQA National 5 Maths Simple probabilities

Simple probabilities

This page covers the following topics:

If all outcomes are equally likely, probability of one outcome is 1 / No. of outcomes.

Randomness and equality

If all several outcomes are equally likely, probability of one such outcome is No. of similar outcomes / No. of outcomes.

Multiple similar outcomes

1

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Calculate the probability of winning a particular prize on the wheel of fortune if there are 25 prizes with equal areas on the wheel. Give your answer as a decimal.

SQA National 5 Maths Simple probabilities Calculate the probability of winning a particular prize on the wheel of fortune if there are 25 prizes with equal areas on the wheel. Give your answer as a decimal.
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2

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Calculate the probability that rolling a standard six-sided dice will give less than 2.

SQA National 5 Maths Simple probabilities Calculate the probability that rolling a standard six-sided dice will give less than 2.
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3

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There are 3 red, 4 blue and 3 green balls in a box. What is the probability of picking a green ball from the box if they are chosen randomly?

SQA National 5 Maths Simple probabilities There are 3 red, 4 blue and 3 green balls in a box. What is the probability of picking a green ball from the box if they are chosen randomly?
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4

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A multiple choice question has options A, B, C, D, E. Find the probability of guessing the answer correctly if both answers B and D are correct.

SQA National 5 Maths Simple probabilities A multiple choice question has options A, B, C, D, E. Find the probability of guessing the answer correctly if both answers B and D are correct.
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5

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There are 15 tea, 20 apple juice and 25 milk drinks provided to students in identical boxes with no labels. Calculate the probability of a student randomly choosing milk.

SQA National 5 Maths Simple probabilities There are 15 tea, 20 apple juice and 25 milk drinks provided to students in identical boxes with no labels. Calculate the probability of a student randomly choosing milk.
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