Zimmerman Bank Solution

f) Zimmerman is considering adding a second teller (who would work at the same rate as the first) to reduce the waiting time for customers. She assumes that this will cut the waiting time in half. If a second teller is added, find the new answers to parts a) through d) above.





Arrival Rate (l) 10 customers/hr
Service time 4 minutes P(0)=
Service Rate (m) 15 customers/hr
Arrival Rate /Service Rate 0.67
Number of servers K 2

r
0.333


Average time a customer will spend in waiting a line (Wq)
First calculating P(0) i (Arrival Rate /Service Rate)^i (Arrival Rate /Service Rate)^i /i! (Arrival Rate /Service Rate)^K P(0)

- 1.0000 1.0000 0.4444
1.0000 0.6667 0.6667 L = Lq + / 