SOLUTION: In a four-child family, what is the expected number of boys?(Assume that the probability of a boy being born is the same as the probability of a girl being born.)

Question 691312: In a four-child family, what is the expected number of boys?(Assume that the probability of a boy being born is the same as the probability of a girl being born.)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a four-child family, what is the expected number of boys?(Assume that the probability of a boy being born is the same as the probability of a girl being born.)
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Binomial Problem where n = 4 and p(girl) = 1/2
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E(x) = np = 4(1/2) = 2
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Cheers,
Stan H.
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