1. (15%) In a waiting line situation, arrivals occur at a rate of 2 per minute, and the service times average 18 seconds. Assume the Poisson and exponential distributions, only one server.
   1. What is ?
   2. What is ?
   3. Find probability of no units in the system.
   4. Find average number of units in the system.
   5. Find average time in the waiting line.
   6. Find average time in the system.
   7. Find probability that there is one person waiting.
   8. Find probability an arrival will have to wait.

SOLVE THE PROBLEM, SHOW YOUR CALCULATIONS USING EXCEL if you

show me numerical results only I will assume you got it from somewhere else.

1. Given the costs below, draw a network representation for this problem.

Repair Shops				Used Car Lots
	S1	S2		L1	L2	L3
Auction 1	550	500	S1	250	300	500
Auction 2	600	450	S2	350	650	450