. In a waiting line situation, arrivals occur at a rate of 2 per minute, and the service times average 20 seconds. Assume the Poisson and exponential distributions.

a.

What is l? What is m?

b.

Find probability of no units in the system.

c.

Find average number of units in the system.

d.

Find average time in the waiting line.

e.

Find probability an arrival will have to wait.