What z-score values form the boundaries for the middle 60% of a normal distribution?
A)z = +0.25 and z = -0.25
B)z = +0.39 and z = -0.39
C)z = +0.52 and z = -0.52
D)z = +0.84 and z = -0.84

Question

What z-score values form the boundaries for the middle 60% of a normal distribution?​
A)z = +0.25 and z = -0.25​
B)​z = +0.39 and z = -0.39
C)​z = +0.52 and z = -0.52
D)​z = +0.84 and z = -0.84

Quizplus · Accepted Answer

The middle 60% of a normal distribution corresponds to the central area, leaving 20% in each tail. The z-scores for the 20th and 80th percentiles are approximately -0.84 and +0.84, respectively.

What Z-Score Values Form the Boundaries for the Middle 60