SOLUTION: a coin is tossed 5 times find the probability of at most 4 tails. use combination formula

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Question 596269: a coin is tossed 5 times find the probability of at most 4 tails. use combination formula
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
a coin is tossed 5 times find the probability of at most 4 tails. use combination formula
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Binomial Problem with n = 5 and p(tail) = 1/2
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P(0<= x <=4) = 1 - P(x = 5)
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= 1 - 5C5(1/2)^5*(1/2)^0 = 1 - 1*(1/32)*1 = 31/32
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Cheers,
Stan H.
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