A fair coin is flipped 4 times What is the probability of ex

A fair coin is flipped 4 times. What is the probability of exactly two heads being flipped?

Please show all work and explain your methods.

Solution

Solution:

It\'s a binomial problem with n=4, p=1/2, x = 2
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P(x=2) = 4C2*(1/2)^2(1/2)
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P(x=2) = 6(1/4)(1/2)
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P(x=2) = 6/8 = 3/4