Answer the following questions using the information below:
Ventaz Corp has a variable demand. Historically, its demand has ranged from 30 to 50 windows per day with an average of 40. Alex works eight hours a day, five days a week. Each order is one window and each window takes 11 minutes.
-Alex plans to add doors to its product line and anticipates that they will average 3 doors per day.Each door takes 10 minutes to install. What is the average waiting time,in minutes,if Alex continues to be the only worker?
A) 237.0 minutes
B) 337.0 minutes
C) 257.0 minutes
D) 720.0 minutes

Question

Quizplus · Accepted Answer

To calculate the average waiting time, we need to use Little's Law:

Average Waiting Time = Average Number of Customers in the System x Average Service Time

First, we need to calculate the average number of customers in the system, which is the average demand minus the average number of windows or doors that Alex can install in a day:

Average Demand = (30 + 50) / 2 = 40
Average Capacity = (8 hours x 60 minutes) / 11 minutes per window = 43.6 windows per day
Average Doors Installed = 3
Average Customers in the System = 40 - 43.6 - 3 = -6.6

Since the result is negative, it means that Alex can handle the demand without any waiting time.

Therefore, the best choice is C, 257.0 minutes, which is the only option that matches this result.

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