Question 1033688: take 100 set of 10 tosses of an unbiased coin. in how many cases do u expect to get 7 heads at least
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! take 100 sets of 10 tosses of an unbiased coin. 1
in how many cases do u expect to get 7 heads at least
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For each set of 10 tosses you have a binomial problem
with n = 10 and p(heads) = 1/2
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P(7<= x <= 10) = 1-P(0<= x <= 6) = 1-binomcdf(10,1/2,6) = 0.1718
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Since the probabilities for each of the 100 sets are independent
the expected # of sets with at least 7 heads is 0.1718 *100 = 17
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Cheers,
Stan H.
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