Computing the Probability of an Event with Equally Likely Outcomes

A six-sided number cube is rolled. Find the probability of rolling an odd number.

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
The event “rolling an odd number” contains three outcomes. There are 6 equally likely outcomes in the sample space. Divide to find the probability of the event.

$P (E) = \frac{3}{6} = \frac{1}{2}$

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

A number cube is rolled. Find the probability of rolling a number greater than 2.

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