Z = (score-mean)/SD
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 scores.
Or you can go to http://davidmlane.com/hyperstat/z_table.html
True or False
If one score is randomly selected from a normal distribution with = 100 and = 20, the probability of obtaining a score between X = 80 and X = 120 is 0.3413.
2 answers
False