In: Statistics and Probability
During the early morning hours, customers arrive at a branch post office at an average rate of 45 per hour (Poisson), while clerks can handle transactions in an average time (exponential) of 4 minutes each.
Fill in the following information:
Lq = Avg Number in Line
Wq = Avg Time in Line
Ws = Avg Time in System
For M = 7:
Lq = 0.028
Wq = 0.0006 Hours
Wq = 0.0373 Minutes
Ws = 4.0373 Minutes
For M = 6:
Lq =
Wq = Hours
Wq = 0.132 Minutes
Ws = Minutes
For M = 5:
Lq =
Wq = 0.00787 Hours
Wq = Minutes
Ws = 4.472 Minutes
For M = 4
Lq =
Wq = 0.03396 Hours
Wq = Minutes
Ws = Minutes
Format your answers as x.xxx
The minimum number of clerks needed to keep the average time in the system to under 5 minutes =