A couple plans to have three children. There are eight possible arrangements of girls and boys. For example, GGB means the first two children are girls and the third child is a boy. All eight arrangements are (approximately) equally likely. (a) Write down all eight arrangements of the sexes of three children What is the probability of any one of these arrangements? - (b) Let X be the number of girls the couple has. What is the probability that X = 2? c Starting from your work in (a), find the distribution of X. That is, what values can X take, and what are the probabilities for each value?

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter14: Counting And Probability
Section14.CR: Chapter Review
Problem 35E
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A couple plans to have three children. There are eight possible arrangements of girls and boys. For example, GGB means the first two children are girls and the third child is a boy. All eight arrangements are (approximately) equally likely.

(a) Write down all eight arrangements of the sexes of three children

What is the probability of any one of these arrangements?
-

(b) Let X be the number of girls the couple has. What is the probability that X = 2?

c Starting from your work in (a), find the distribution of X. That is, what values can X take, and what are the probabilities for each value?

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