A psychologist studied the time x (in seconds) it took a subject to complete a pencil and paper maze while in the presence of a floral scent. Suppose x has a normal distribution with mean 70 seconds and standard deviation 15 seconds. Find P(X<58)

Answer 1

you can play around with Z table stuff at

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

Answer 2

Another way.

Z = (score-mean)/SD = (58-70)15 = ?

Then find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.