Suppose the scores of students on an exam are Normally distributed with a mean of 297 and a standard deviation of 66. Then approximately 99.7% of the exam scores lie between the numbers _____and _______such that the mean is halfway between these two integers.

Answer 1

you can play around with Z table stuff at

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

It has very nice input forms so you can specify tails or middle regions.

Answer 2

363-231