A local drugstore knows that on the average 60 people stop by his store per hour.
a) What is the probability that in a given 3-minute period nobody enters the store?
b) What is the probability that at least 15 people enter the store during 9:15 a.m. to 9:30 a.m.?
c) How many people are expected to enter the store in a given 10 minute period?
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