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?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.6: Permutations
Problem 31E
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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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