Question

Despite he outrageous incomes of some, the mean income of all aging rock stars is relatively modest: $75,000 with a standard deviation of $2,000. On that scale, Chubby Checker, appears to do better than average: at most, only 6.25% of aging rockers make more than he does. what is Chubby Checkers income?

Answer 1

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

Answer 2

Here is process:

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 (.0625) and its Z score. Insert data into above equation and solve for score.