QUESTION $18$

$M^2$ has a queuing problem where customers who line up to pay their selections form the waiting line. $T{h}^2$ system consists of a service times are on average equal to $1$ minute per customer.

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

a$.0\mathrm{.}952$

b$.0\mathrm{.}152$

c$.3\mathrm{.}2$

d$.4\mathrm{.}0$

e$.0\mathrm{.}083$