Question 607292
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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=5/8 & q= 3/8 
nCx = {{{n!/(x!(n-x)!)}}}
For Ex:
P(3) = 20{{{(5/8)^3*(3/8)^3}}} = .2575
p(&#8805;3) = P(3)+P(4)+P(5)+P(6)= .8535
Can Recommend Stattrek.com for Bionomial Probability Problems