(b) [6 points] How many servers are needed at each queue just to keep up the steady state, i.e., > / for all .

(c) [3 points] What facility is already achieved at the steady state?

12. [15 points] Consider a Jackson network with three service facilities having the parameter values shown below. Pij Facility ( ) Cj Hj aj i = 1 i = 2 i = 3 1 1 3 1 0.0 0.1 0.4 2 3 4 4 0.6 0.0 0.4 3 1 2 3 0.3 0.3 0.0