Question 930582: Suppose that the probability of parents having a child with blond hair is 1/4. If there are 6 children in the family, what is the probability that half of them will have blond hair? What is expected value, or mean, and standard deviation for this distribution?
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! p(blond) = .25, n = 6
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P(x = 3) = binompdf(6, .25, 3) = .1318 0r 13.18%
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mean = .25(6) = 1.5
sd = sqrt(.25*.75*6) = 1.0607
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