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 less 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 the time that the number of boxes received is less than 160 corresponds to the cumulative probability of a z-score of -2, which is approximately 2.28%.

A Plant Manager Knows That the Number of Boxes of Supplies