It is known that 20% of all persons given a certain medication get very drowsy within 2 minutes. Find the…

It is known that 20% of all persons given a certain medication get very drowsy within 2 minutes. Find the probabilities that among 15 persons given the medication: a. at most 2 will get very drowsy within 2 minutes b.at least 5 will get very drowsy within 2 minutes