Willow Brook National Bank operates a drive-up tel

Willow Brook National Bank operates a drive-up teller window that allows customers to
complete bank transactions without getting out of their cars. On weekday mornings, arrivals to
the drive-up teller window occur at random, with an arrival rate of 24 customers per hour or 0.4
customers per minute.
a. What is the mean or expected number of customers that will arrive in a five-minute
period?
b. Assume that the Poisson probability distribution can be used to describe the arrival
process. Use the arrival rate in part (a) and compute the probabilities that exactly 0, 1,
2, and 3 customers will arrive during a five-minute period.
c. Delays are expected if more than three customers arrive during any five-minute period.
What is the probability that delays will occur?

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