Posted by **Robbie** on Sunday, October 14, 2012 at 12:08am.

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

- statistics -
**MathGuru**, Monday, October 15, 2012 at 8:35pm
How about d?

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