Number of servers m

Average interarrival time a

Average service time Ws

Coefficient of variation CVa

Coefficient of variation CVWs

$$100$ per hour while the hourly cost of a truck waiting is $$500.$ Complete the following input table for using the Queue.xls$.(5$ points$)$

$($c$)$ The following is the output of the Queue.ls Excel program. Each worker is paid $$100$ per hour while the hourly cost of a truck waiting is $$500.$ Is there any economic justification for adding the second crew?

$(5$ points$)$

Two Crews

Utilization factor p

$0\mathrm{.}375$

Waiting time in queue Wa $($min$)$

$2\mathrm{.}90$

Flow time $($or total time in the system$)$ W $($min$)$

$17\mathrm{.}90$

Inventory in the queue Wa

$0\mathrm{.}1448$

Inventory in the system L

$0\mathrm{.}8949$