A couple is thinking about having 3 children. Assume that each child is equally likely to be a girl or a boy. What is the probability that exactly 2 of the children are girls?

With 3 children, there are 2³ = 8 equally likely boy-or-girl outcomes. Exactly 2 girls can happen in 3 ways: GGB, GBG, or BGG. So the probability is 3/8 = 0.375, which is choice C, 0.375.

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