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Time left $0$:$56$:$08$

Section $2$

A large, club$-$style grocery store is attempting to staff its check$-$out registers. Currently, the arrival rate is $=135$ customers per hour and each server has an average service time of $E[T]=400$ seconds $($note this is roughly double the time for a regular grocery store$--$the higher time is to account for large, bulk items$).$ Our usual assumption holds where the interarrival and service times follow an exponential distribution.

Calculate the average service rate $($in hours to match $).$

a$.7\mathrm{.}2$ customers per hour

b$.16$ customers per hour

c$.12$ customers per hour

d$.9$ customers per hour

Clear my choice