Hi

Note: The probability of x successes in n trials is: 

P = nCx*  where p and q are the probabilities of success and failure respectively. 

In this case p =.6 and q = .4

nCx = 

60% of the population has brown eyes and we randomly select 12 people

P(exactly 4 of them have brown eyes)= 495(.6)^4(.4)^8 = .042 

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