# Chapter 4 - Probability - 4-2 Basic Concepts of Probability: 39

$0.5$

#### 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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