SOLUTION: 2. Approximately 20% of the population belongs to a health maintenance organization (HMO). Assume that for a randomly selected group of 20 adults, the number belonging to an HMO ha

Question 574069: 2. Approximately 20% of the population belongs to a health maintenance organization (HMO). Assume that for a randomly selected group of 20 adults, the number belonging to an HMO has a binomial distribution.
a. What is the probability of finding exactly 5 in the 20 who belong to an HMO?
b. What is the probability of finding at least one in the 20 who belongs to an HMO?

Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Let X = the number belonging to an HMO
a. P(X = 5) =
= 0.17456
b.
=
= 0.98847

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