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A friend’s family just welcomed their third child. It turns out that all 3 of the children in this family are girls, and they are not twins. Suppose that for each birth the probability of a “boy” birth is 0.5 and the probability of a “girl” birth is also 0.5. What are the chances of having three girls in the first 3 births? Type the number in the box in the format X.XXX