In a normal distribution, what z-score value separates the highest 90% of the scores from the rest of the distribution?

Question

a)z = -1.28
b)z = 1.28
c)z = -0.13
d)z = 0.13

Answer 1

Look up the Z scores in the back of your stat text labeled something like "areas under the normal distribution." That should give you the answer.