Question

for a standard normal curve, find the z-score that separates the bottom 30% from the top 70%

Answer 1

In the back of your statistics text, there is a table labeled something like "areas under the normal distribution." Remembering that the Z score will be negative because it is below the mean, use it to find the Z value that has either .30 for the smaller side or .70 for the larger side.

I hope this helps. Thanks for asking.

Answer 2

.325