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OpenStudy (anonymous):
Out of two thousand families with four children each, how many would you expect to have one or two girls? Assume the probability of a male birth is 1/2
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OpenStudy (perl):
lets look at 1 family with 4 children
OpenStudy (perl):
the probability of having one or two children is P( X = 1 or X = 2) = P( X=1) + P(X=2)
OpenStudy (perl):
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