Question 872787
 <pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
p(bad) = 3/15 = 1/5 = .2
P(1st 3 good) = (.8)^3 = .512
P(1st 3 bad) =  (.2)^3 = .008
P(3rd is 1st bad one), 13 left(3bad), p(bad) = 3/13
P(1 out of 3 bad)= binonpdf(3, .2, 1) = .384