<PRE><B>Question 525062</B>
Flip a fair coin 4 times. What is the probability of observong exactly three heads?
*Should I use binomial distribution or HHH method?
Yes
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Binomial Problems with n = 4 ; p(H) = 1/2
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P(x = 3) = 4C3(1/2)^3*(1/2) = 4*(1/2)4 = 4/16 = 1/4
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Cheers,
Stan H.
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