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 = .60 and q = .40

nCx =   n = 20 and x = 10

P(>10 passing out of 20) = .7553 = P(11) + P(12)+...P(20)

for example:

P(11)= 167960(.6)^11).4)^9 = .1597    | 20C11 = 167960 

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