statistics
posted by Chris .
Suppose that SAT scores among U.S. college students are normally distributed with a mean of 450 and a standard deviation of 150. What is the probability that a randomly selected individual from this population has an SAT score at or below 600?

Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion for the Z score calculated.