Suppose jobs arrive at a single$-$machine workstation at a rate of $20$ per hour and the average

process time is $2\mathrm{.}5$ minutes.

$($a$)$ What is the utilization of the machine?

$($b$)$ Suppose that interarrival and process times are exponential.

i$)$ What is the average time a job spends at the station?

ii$)$ What is the average number of jobs at the station?Suppose jobs arrive at a single$-$machine workstation at a rate of $20$ per hour and the average

process time is $2\mathrm{.}5$ minutes.

$($a$)$ What is the utilization of the machine?

$($b$)$ Suppose that interarrival and process times are exponential.

i$)$ What is the average time a job spends at the station?

ii$)$ What is the average number of jobs at the station?