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QUESTION $18$

Suppose a bank has one teller. Customers arrive at the rate of $10$ per hour $($assume Poisson arrivals$),$ and on the average it takes $5$ minutes to serve a customer $($assume exponential service times$).$ The average number of customers waiting in system is $5.$ What is the average number of customers waiting in the queue?

$4$

Cannot be determined

$5\mathrm{.}67$

$5$

$4\mathrm{.}17$