QUESTION MM$2$ 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 $3$ per hour according to a Poisson distribution $,$ and service times are on average equal to $16$ minutes per customer $.$ What is the number of customers waiting in the queue on average $?$ Oa$\mathrm{.}3\mathrm{.}2$ b$\mathrm{.}0\mathrm{.}1520\mathrm{.}952.1\mathrm{.}333$ Oe$\mathrm{.}4\mathrm{.}0$