$($b$)$ As a tool service centre the arrival rate is two per hour and the service potential is

three per hour. Simple queve conditions exist.

The hourly wage paid to the attendant at the service centre is $1\mathrm{.}50$ per hour and the

hourly cost of a machinist away from his work is $4.$

Calculate:

$($i$)$ The average number of machinists being served or waiting to be served at any

given time.

$($ii$)$ The average time a machinist spends waiting for service.

$($iii$)$ The total cost of operating the system for an eight $-$ hour day.

$($iv$)$ The cost of the system if there were two attendants working together as a team,

each paid $1\mathrm{.}50$ per hour and each able to service on average $2$ per hour. Pls answer only if you know the correct calculations, otherwise do not attempt