Question 706813
If the probability that a certain tennis player will serve an ace is 1/4, what is the probability that he will serve exactly two aces out of four serves? 
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Binomial Problem with n = 4 and p(ace) = 1/4
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P(x = 2) = 4C2*(1/4)^2*(3/4)^2 = binompdf(4,1/4,2) = 0.2109
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Cheers,
Stan H.
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