Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 11 - Counting Methods and Probability Theory - 11.8 Expected Value - Exercise Set 11.8 - Page 755: 26

Answer

Doesn't make sense

Work Step by Step

Doesn't make sense, because $2.5$ is the correct expected value because this refers to the average number of boys that a lot of families with $5$ kids will have, not the number of boys one family will have.
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