finite math
posted by margie .
1. what are the mean and standard deviation for this distribution of weekly takehome pay amounts?
2. what percentage of the pay amounts lie within 1 standard deviations of the mean?
3. what percentage of the pay amounts lie within 2 standard deviations of the mean?
4. what percentage of the pay amounts lie within 3 standard deviations of the mean?
5. what is the range of the pay amounts?

What distribution?
Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
http://en.wikipedia.org/wiki/File:The_Normal_Distribution.svg