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OpenStudy (anonymous):
A fair coin is tossed 3 times in a row what is the probability that heads appears exactly 2 times
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OpenStudy (anonymous):
Please help
OpenStudy (anonymous):
there are 8 total outcomes HHH HHT HTH HTT THH THT TTH TTT How many of them have 2 heads?
OpenStudy (anonymous):
according to binomial distribution. the probability that head appears exactly two times is: 3C2 * (1/2)^2 * (1-1/2)^(3-2) = 3/8
OpenStudy (madhu.mukherjee.946):
its 3 /8 times
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