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According to an airline flights on a certain route are on time 85% of the time....

According to an airline flights on a certain route are on time 85% of the time. Suppose 15 flights are randomly selected and the numbee of on time flights is recorded.
a) Explain why this is a binomial experiment.
b) Find and interpret the probability that exactly 11 flights are on time.
c) Find and interpret the probability that fewer than 11 flights are on time.
d) Find and interpret the probability that at least 11 flights are on time.
e) Find and interpret the probability that between 9 and 11 flights inlcusive are on time.

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