# What is the average waiting time in the system?

**What is the average waiting time in the system?**

A mechanic services 5 drilling machines for a steel plate manufacturer. Machines break down on an average of once every 6 working days, and breakdowns tend to follow a Poisson distribution. The mechanic can handle an average of one repair job per day. Repairs times follow an exponential distribution.

1. What is the average waiting time in the system?

2. What is the average waiting time in the queue?

3. On average, how many machines are waiting to be repaired?

4. On average, how many machines are in working order?

5. On average, how many machines are being repaired?

**What is the average waiting time in the system?**

What is the average waiting time in the system?

*What is the average waiting time in the system?*