Question 471555
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Hi,
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(male)= 40,000/50,000 =  = .8 and q(female) = .2
nCx = {{{n!/(x!(n-x)!)}}}
 3 chosen
 P(3 males) = (.8)^3 = .512