Actual waiting time in minutes of customers in the shop

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Reference no: EM132293597

Rosalee is the only employee and works full-time (8 hours from 9am to 5pm) at a coffee and tea shop in Portland. The shop serves an average of 48 customers daily. Rosalee takes an average of 7.5 minutes to fulfill each customer’s order. Assume there are no limits on the number of customers that can be waiting in the shop, that each customer places one order, and that customers are remarkably patient when waiting for their orders, enough not to leave.

What is the throughput of this process (per hour)?

How much idle time (in hours) does Rosalee expect to have during her 8-hour shift?

Rosalee estimates that there is an average of 3 customers (both waiting and being served) in the shop throughout the day. Using Little’s Law, what is the average waiting time (Wq) in minutes based on Rosalee’s estimation?

In order to improve her process, Rosalee enlists the help of her friend Monroe to record arrival and service times. Monroe’s record keeping reveals that the customers’ daily inter-arrival time has a standard deviation of 10 minutes, and that Rosalee’s service time has a standard deviation of 3 minutes.

Using this additional data, what is the actual waiting time (Wq) in minutes of customers in the shop (ignore Rosalee’s previous estimation of 3 customers in the shop)?

What is the actual average number of customers Ls in the shop?

Reference no: EM132293597

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