Math
posted by Mike .
Suppose scores on an IQ test are normally distributed. If the test has a mean of 100 and a standard deviation of 10, what is the probability that a person who takes the test will score between 90 and 110?

wonderful program for your type of question.
Just enter the mean and sd ,then 90 and 110 for the 'between' 
forgot the link
http://davidmlane.com/hyperstat/z_table.html 
Cool, thanks!