A super market has two girls attending to sales al counters. It the service time for each oustomer is exponential wiln mean 4 minutes and if people arrive in Poisson fashion al the rale of 10 per hour, (b) What is the expected percentage of idle time for each girf?

Explanation

The expected idle time for each girl is given by E[T] = 1/μ - 1/λ. In this case, E[T] = 4/3 minutes, which is equivalent to 80% of the total time.