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Old 03-05-2009   #2
elaslawek
 
Join Date: Feb 2009
Posts: 11
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ill try to explain it to you :

Find The mean of the set
Subtract the mean from every number in the set
Square each number
Add all of them
Divide by the total number in the set -1 (If there are 5 in the set, divide by 4)
Take the square root.
Walah.
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