how do i set up data to find the standard deviation of the data?

Answer 1

first you need the mean
Xmean =sum of all points/number of points
then you need a list of differences from mean
(Xi-Xmean)
some will be - and some +
then square the values in that list
(Xi-Xmean)^2
divide by (n-1) one less than number of points
take the square root

Answer 2

check out:
http://www.easycalculation.com/statistics/learn-standard-deviation.php