Question

in a recent poll of city voters it was found that 90% liked the view of the city skyline.find the probability that exactly 2 voters in a sample of 5 voters will like the viewof the city skyline.

Answer 1

prob of liking = .9
prob of not liking = .1

prob that 2 of 5 will like = C(5,2)(.9)^2 (.1)^3)
= 10(.81)(.001) = .0081