Question 675744
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Hi
probability that exacly 4 boys in 10 births = {{{10C4(.5)^4(.5)^6}}}
Note: The probability of x successes in n trials is: 
P = nCx* {{{p^x*q^(n-x)}}} where p and q are the probabilities of success and failure respectively. 
In this case p & q are = 1/2 or .5   and n = 10