What is one reason that it is difficult to devise formulas to answer simple questions about a supermarket checkout system?
A) the variability of essential factors
B) the regularity in which customers arrive
C) because customers always purchase the same number of items
D) because the same number of customers are there at all times of the day

Question

Quizplus · Accepted Answer

Variability of essential factors such as the number of customers, the number of items they purchase, and the time they spend at the checkout counter can make it difficult to come up with a simple formula for the supermarket checkout system.

What Is One Reason That It Is Difficult to Devise