Matching Supply with Demand 3rd Edition by Gerard Cachon,Christian Terwiesch

Exercise 1

(Loss System) Flow units arrive at a demand rate of 55 units per hour. It takes, on average, six minutes to serve a flow unit. Service is provided by seven servers.
a. What is the probability that all seven servers are utilized
b. How many units are served every hour
c. How many units are lost every hour