A television repairman finds that the time spent on TV sets has an exponential distribution with mean of 20 minutes. If he repairs sets in the order in which they came in, and if the arrival of sets follows a Poisson distribution approximately with an average rate of 15 per 8-hour day, what is the repairman’s expected idle time each day in hours?

A television repairman finds that the time spent on TV sets has an exp

1.	A television repairman finds that the time spent on TV sets has an exponential distribution with mean of 20 minutes. If he repairs sets in the order in which they came in, and if the arrival of sets follows a Poisson distribution approximately with an average rate of 15 per 8-hour day, what is the repairman’s expected idle time each day in hours?
A.	3
B.	2
C.	5
D.	4
Answer» B. 2