Arrivals at a telephone booth are considered to be Poisson with an average time of 10 minutes between one arrival and the next. The duration of a phone call is assumed to be distributed exponentially with mean 3 minutes. Find the following. (d) Find the average number of units in the system.

Explanation

The utilization factor is given by the formula λμ / (λ + μ), where λ is the arrival rate and μ is the service rate. In this case, λ = 1/10 and μ = 1/3. Therefore, the utilization factor is 0.5. The average number of units in the system is given by the formula L = ρ / (1 - ρ), where ρ is the utilization factor.


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