Note: A waiting line model solver computer package is needed to answer these questions.

arrival process. One person from the maintenance department provides the single$-$server repair service for the six machines.

for each individual assigned to the repair operation is $0\mathrm{.}40$ machines per hour.

$($a$)$ Compute the operating characteristics if the company retains the single$-$employee repair operation. $($Round your answers to four decimal places. Report time in hours.$)$

$L_q=$

$L=$

$w_q=$

$w=$

$h$

$h$

$($b$)$ Compute the operating characteristics if a second employee is added to the machine repair operation. $($Round your answers to four decimal places. Report time in hours.$)$

$L_q=$

$L=$

$w_q={?}^h$

$w=h$

nearest cent.$)$

$TC(k=1)=$$

$TC(k=2)=$$

The total cost to operate all eight machines favors the use of $--$ Select$--,$ to maintain and repair them.