the income of a group of 10,000 health system employees was found to be normally distributed with a mean=750 pm and standard deviation=50. show that of this group about 95% had income exceeding 668 and only 5% had income exceeding 832

Answer 1

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.

Answer 2

10000

Answer 3

It is clear that because in normal distribution curve within 1 standard deviation (700-800)at 68.34% and within 2SD (650-850)at 95%