Question: A small barber shop has a single chair and an area for waiting, where only one person can be in the chair at a time,

A small barber shop has a single chair and an area for waiting, where only one person can be in the chair at a time, and no one leaves without getting their hair cut. So the system is roughly:
Entrance Wait Haircut Exit
Assume customers arrive at the rate of 10 per hour and stay an average of 0.5 hour. What is the average number of customers in the barber shop?

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