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, (a) Find the probability that a cuslomer has lo wail for service.

Explanation

The probability of waiting for service is given by the formula P0 = 1 - ρ, where ρ is the utilization factor. In this case, ρ = λ/2μ = 1/8.