We have no ideal on how to start this problem, we have look for it on the charts, did not see. Please help

Consider the following. (Give your answers correct to two decimal places.)
(a) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3989.


(b) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.4875.


(c) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3628.

2 answers

I think a visit to

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

will help a lot here.
I have looked at that page and really do not understand how to use it, it ask for mean, sd, below, above etc. Would you please just once show me how to plug the information into this graph and I also get mixed up on which one to use. It looks like it may help me if I just knew how to use it.