The output of a process is stable and normally distributed.If the process mean equals 23.5,the percentage of output expected to be less than or equal to the mean:
A)is less than 25%.
B)is 50%.
C)is greater than 75%.
D)cannot be determined without knowing the standard deviation value.

Question

Quizplus · Accepted Answer

A normal distribution is symmetric, meaning that the area under the curve to the left of the mean is equal to the area under the curve to the right of the mean. Therefore, 50% of the output is expected to be less than or equal to the mean value of 23.5.

The Output of a Process Is Stable and Normally Distributed