1. During finals week, students arrive randomly at the help desk of the computer lab, forming 2 separate lines, each manned by one server. The average arrival rate is 15 students per hour per line, and the average service rate is 20 students per hour for each line. Assuming standard waiting line distribution parameters hold.

Students complain about the waiting time and admin decides to change the layout and pool all incoming arrivals into a single line, to be served by 2 servers together, with arrivals going to whichever server happens to be free at the moment.

What was the performance benefit in terms of avg. # waiting in line from pooling the 2 lines with separate servers into a single line with 2 servers. (Use WL Table)

A) 16%

B) 14.67%

C) 18.56%

2. Re-inspection is a ___ cost

A)External failure

B)Prevention

C)Internal

3. "Given the following data at the drive-through of a bank, what is the interarrival time (time between arrivals) between the second and third customers? "

Customer	Arrival Time	Service Time (minutes)
1	8:06	5
2	8:10	10
3	8:15	7
4	8:36	2

A) 5 minutes

B) 10 minutes

C) 20 minutes

M= Number of servers = Arrival Rate - ex. People per Hour = Service Rate ex. People per Hour