Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 5 - Discrete Probability Distributions - 5-3 Binomial Probability Distributions - Page 217: 1

Answer

This is only 1 out of the ${5 \choose 2}$ possibilities.

Work Step by Step

We want to know the probability of exactly two adults including Wal-Mart. In the construction, we are given that the first two adults include Wal-Mart, and the other 3 don't. However, this is only 1 out of the ${5 \choose 2}$ possibilities, and we have to count those too.
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