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Old January 31, 2013, 05:42 PM   #8
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Join Date: July 7, 2008
Location: Upper midwest
Posts: 4,409
Without going all technical, standard deviation is a measure of how tightly a set of values clusters around the mean (arithmetic average) of those values: the smaller the SD, the less those values spread out around the mean.

Easy to calculate in Excel: the basic formula is =STDEV(number 1;number 2;...). Generally you'll replace "number 1..." with the cell references where the numbers can be found: so =STDEV(A1;A50) will give the standard deviation of the values in the cells from A1 to A50.

Easy as pi.

It's a pity that you can't just upload the spreadsheet here and insert it into your post as an attachment -- wouldn't it just raise the tone if we could all upload spreadsheets? Talk about responsible gun owners...
"Once the writer in every individual comes to life (and that time is not far off), we are in for an age of universal deafness and lack of understanding."
(Milan Kundera, Book of Laughter and Forgetting, 1980)
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