QUESTION $26$

MM$?$ has a queuing problem where customers who line up to pay their selections form the waiting line. The MM$?$ system consists of an arrival rate of $48$ per hour according to a Poisson distribution, and service times are on average equal to $1$ minute per customer.

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

$$ a$.0\mathrm{.}152$

$$ b$\mathrm{.}4\mathrm{.}0$

$.0\mathrm{.}083$

$$ d$.3\mathrm{.}2$

$$ e$.0\mathrm{.}952$