Q$1)$ Derive that the expected number of jobs in a queue is given by $\frac{{}^2}{1-},$ where $$ is the service

utilization. Show all the necessary steps to derive this formula.

Q$2)$ Derive that the probability of number of jobs $L$ in a system is greater than $k$ is given by

$P(L>k)={}^{k+1}$ where $$ is the service utilization. Show all the necessary steps.