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ISEE Middle Level Math : How to find the probability of an outcome

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Example Question #71 : Outcomes

If a class has boys and girls, what is the probability the teacher will call on a boy?

Possible Answers:

$\frac{1}{10}$

$\frac{5}{11}$

$\frac{10}{12}$

Correct answer:

$\frac{5}{11}$

Explanation:

To find the probability of an event, we will use the following formula:

$\text{probability of an event} = \frac{\text{number of ways event can happen}}{\text{total number of possible outcomes}}$

Now, in the event of calling on a boy in the class, we can determine the number of ways the event can happen:

$\text{number of ways event can happen} = 10$

because there are 10 boy students in the class.

To find the number of possible outcomes, we get

$\text{total number of possible outcomes} = 22$

because there are 22 total students the teacher could potentially call on.

Knowing all of this, we can substitute into the formula. We get

$\text{probability of calling on a boy} = \frac{10}{22}$

Reduce:

$\text{probability of calling on a boy} = \frac{5}{11}$

Therefore, the probability of calling on a boy is $\frac{5}{11}$ .

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ISEE Middle Level Math : How to find the probability of an outcome

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Question #71 : Outcomes

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