A poll reported that 65% of adults were satisfied with the job the major airlines were doing.

Suppose 9 adults are selected at random and the number who are satisfied is recorded.

(a) Explain why this is a binomial experiment.

(b) Find and interpret the probability that exactly 7 of them are satisfied with the airlines.

(c) Find and interpret the probability that at least 6 of them are satisfied with the airlines.

(d) Find and interpret the probability that between 4 and 7 of them, inclusive, are satisfied with the airlines.

(e) Would it be unusual to find more than 6 who are satisfied with the job the major airlines were doing?