Question: A bank has a drive-in window, which is open from 10 a.m. to 3 p.m. on business days. Customers drive up at a rate of

A bank has a drive-in window, which is open from 10 a.m. to 3 p.m. on business days. Customers drive up at a rate of 12 per hour, according to a Poisson distribution. The teller requires a mean of 2.4 minutes to serve each customer.

36) What is the proportion of idle time?

A) .48

B) .50

C) .20

D) .52

E) .26

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