# statistics

posted by
**Robbie** on
.

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