Sixty-nine percent of U.S. adults plan to get a COVID-19 vaccine or already have. You randomly select ten U.S. adults and ask them whether they plan to get a COVID-19 vaccine or already have. Find the probability that the number who plan to get a COVID-19 vaccine or already have is

(a) exactly seven,

(b) more than eight, and

(c) from two to four.

In Exercises 21–26, find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine whether the events are unusual. If convenient, use a table or technology to find the probabilities.