Question

The cholesterol levels of adult American women are approximately normal with the mean of 188 mg/dl and a standard deviation of 24 mg/dl. a company wants to test a certain medication for women falling in the highest 15% of cholesterol readings. what is the lowest cholesterol reading a women might have and still be in the test group? never done these type of problems so it would h.elp on this one so I could do others

Answer 1

Just go here

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

Answer 2

but how do use percent?