Customers arrive at a system with a singe$-$server queue via a Poisson process with rate of $1$ customer every $5$ minutes. The service time of each customer is exactily $4$ minutes.

There are $6$ Questions $($Pay attention to the units. Numerical answers only$)$:

$\frac{M}{D}\frac{?}{1}$

Q$1$: Identify the queuing model:

$\frac{M}{O}\frac{?}{1}$

Q$2$: Determine A :

$11$

customers$/$ hour

Q$3$: Determine $$ : $15$ costomers$/$hour

$Q4$: $bs$ the system stable? yes : $DC$

Q$5$: Determine the average number of customers in the queuing system. $2\mathrm{.}4$

customers

Q$6$: Determine the average waiting time of a customer in the queve. & W W minutes