Math Helppp
posted by TJ .
Scores for men on the verbal portion of the SATI test are normally distributed with a mean of 509 and a standard deviation of 112.
(a) If 1 man is randomly selected, find the probability that his score is at least 579.
(b) If 13 men are randomly selected, find the probability that their mean score is at least 579.

you can play around at
http://davidmlane.com/hyperstat/z_table.html
and do all kinds of neat Ztable stuff. Just enter your mean and std and you can see the areas (probabilities) for various kinds of calculations.