Posted by Lucy on Wednesday, October 8, 2008 at 3:50pm.
A set of data is normally distributed with a mean of 500 and a standard deviation of 40. What percent of the data is between 460 and 540?
Answer: 68.3%

Precalculus  bobpursley, Wednesday, October 8, 2008 at 3:57pm
Yes, that is the definition of a standard deviation.