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Checkout problem

A grocery store chain is considering ways to improve the performance of the waiting lines at their checkout stands. A heavily trafficked checkout stand is monitored for 120 min. In that period, 60 customers have their groceries rung up, and depart from the store. The cashier was observed to be busy 75% of the time. Show calculations.

a. What is the number of arrivals at that checkout line?
b. What is the average arrival rate into that waiting line?
c. What is the average throughput at that checkout stand?
d. What is the average service time per customer?
e. What are the units of the service time metric in this problem?

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