Consider an $\frac{M}{D}\frac{?}{?}\frac{1}{n}$ queue where the Poisson arrival process has parameter $.$ Assume that this

queueing system is stable.

If each customer spends $w_1$ unit of time in the system on average, what is the expected number

of customers in the system?

If each customer spends $w_2$ on average unit of time in the queue, what is the expected queue

length?