Nurses stations are a three step process. First is check in which has a mean of 5 minutes. The second is the waiting room which has a mean of 3 minutes and the final is the patient room with a mean of 7 minutes. Assume that these have an exponential processing time.

a. How much worse are the CT and TH of the exponential case from the "best case" at critical WIP on a percentage basis.

b. At what value of WIP will average TH from the exponential line be 80% of that for the "best case" line.