A plant manager knows that the number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20.What percentage of the time will the number of boxes received weekly be fewer than 160?
A)2.28%
B)57.93%
C)42.07%
D)4.56%

Question

Quizplus · Accepted Answer

The z-score for 160 is (160-200)/20 = -2. The percentage of time corresponding to a z-score of -2 in a standard normal distribution is approximately 2.28%.

A Plant Manager Knows That the Number of Boxes of Supplies