<PRE><B>Question 331636</B>
During a sale, 1/6 of the CD prices are reduced. Find the probability that 2 of 4 randomly-selected CDs have reduced prices?

X=# CD that have reduced prices,  
X ~ Hypergeometric distributed, but if N (the population of CDs available) is large compared to the sample size, n then we can use the binomial distribution.
X ~Binomial(n,p) =Binomial(4,1/6)

{{{P(X=2) = 4C2*(1/6)^2*(5/6)^(4-2) = 6*(1/36)*(25/36) = 0.1157}}}


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