Essentials of Statistics (5th Edition)

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

Chapter 4 - Probability - 4-2 Basic Concepts of Probability - Page 147: 39

Answer

$0.5$

Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$. When having 4 kids, there are 4 opportunities:boy-boy, boy-girl, girl-boy, girl-girl. Therefore the probability of getting one child of each sex is (2 opportunities out of 4):$\frac{2}{4}=0.5$
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