Question: A recent analysis at a Staples store by the store manager indicates that, during operating hours, there are 30 customers arriving every hour, with a

A recent analysis at a Staples store by the store manager indicates that, during operating hours, there are 30 customers arriving every hour, with a standard deviation of inter-arrival times of 2 minutes. This arrival pattern is consistent throughout the day. The checkout is currently operated by one employee, who needs on average 1.85 minutes to check out a customer. The standard deviation of this checkout time is 3 minutes, primarily because of customers buying different numbers of items.

D. The manager decides that the waiting time is way too long and hires two more checkout clerks, for a total of three. What is the waiting time (in the line, before being served) in this new situation?

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