Hector s Department Store from problem 2 has decided to add
Hector's Department Store from problem 2 has decided to add a second checkout register. This second register works at the same average speed as the first. Customer arrivals are the same as before.
a. On average, how many customers will be waiting to be checked out? From a business perspective, is this reasonable?
b. How long, on average, will a customer have to wait before the clerk starts serving him or her? Again, is this a reasonable time?

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