Question

A survey found that 25% of pet owners had their pets bathed professionally rather than do it themselves. If 18 pet owners are randomly selected, find the probability that exactly 5 people have their pets bathed professionally.

Answer 1

Use a binomial probability function table. Values to look up are: p = .25, n = 18, and x = 5.

Or...

Calculate it by hand:
P(x) = (nCx)(p^x)[q^(n-x)]
...where q = 1 - p.

Answer 2

75

Answer 3

0.199