The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems:

Answer 1

I can not see your problems. Copy and paste does not work here. However I am sure this link will do the trick anyway:
http://davidmlane.com/hyperstat/z_table.html