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## Homework Statement

For an M/M/1 queuing system with the average arrival rate of 0.4 min^−1 and the average service time of 2 minutes, compute

A- the expected response time in minutes;

B- the fraction of time when there are more than 5 jobs in the system;

C- the fraction of customers who don't have to wait until their service begins

## Homework Equations

## The Attempt at a Solution

For A I got that λ_A= 2.5 and that λ_S= 1/2 and then r would be 5. Obviously that's wrong since r has to be less than 1 I just don't understand where I messed up.