Question $2-$ On average $120$ customers arrive to a service every hour. As soon as

customers arrive, they wait in the line for the review process. The average number of

people waiting for review is $10.$ After the waiting, the review process takes on average

$10$ minutes. After the review, if there are NOT any problems, then the customers

continue to the next stage. $80$ percent of the customer continue, and $20$ percent leaves

the service at this stage. $20$ percent of the $80$ percent goes to $A,40$ percent of the $80$

precent goes to $B,$ and $40$ percent of the $80$ percent goes to $C.$ Route A takes $10$ min $,$

Route B takes $15$ min $,$ and Route $C$ takes $20$ min $.$

A $-$ Clearly draw the process flow diagram. Make sure you label each activity and buffer

with appropriate Little's Law variables. $(6)$

B $-$ On average, how long does the entire process flow take? $(4)$

$C-$ On average, how many customers are in the process? $(2)$