Question

Find two z-scores so that 40% of the data in the distribution lies between them. (More than one answer is possible). Include a sketch of the distribution with 40% of the area shaded and the corresponding z-scores included.

I'm not sure how to do this problem. Just need a boost to get started. Please.

Answer 1

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability
(.40) and the related Z scores.

Or you could use this source:

http://davidmlane.com/hyperstat/z_table.html