QUESTION $19$

$M{M}^2$ has a queuing problem where customers who line up to pay their selections form the waiting line. The MM ${?}^2$ system consists of an arrival rate of $24$

per hour according to a Poisson distribution, and service times are on average equal to $2$ minutes per customer.

What is the number of customers waiting in the queue on average?

a$.3\mathrm{.}2$

b$.0\mathrm{.}152$

c$.1\mathrm{.}667$

d$.4\mathrm{.}0$

e$.0\mathrm{.}952$