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Probability

Question 1 of 3

Know the idea

A survey of students recorded the following results.

	Grade $10$	Precalculus
play a sport	$13$	$30$
do not play a sport	$16$	$30$

If one of these students is selected at random, what is the probability that the student is in Grade

10

Worked example

Grade

10

has

13 + 16 = 29

students out of

89

total, so the probability is

\dfrac{29}{89}

Video walkthrough

Use the existing worked examples and practice while this walkthrough is being prepared.

A student is selected at random from the bus riders in the table. What is the probability that the student plays a sport?

	Plays a sport	Does not play a sport
Bus rider	$5$	$4$
Not a bus rider	$9$	$9$