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=STDEV(select the range) (Put this formula in an Excel Sheet and select the range of cells where you want to apply it. You will get the deviation.
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Use this function
=Stdev(Range of Value)
Dear You may see the below and you know how to get standerd deviation in excel its very clear in the below link
http://www.psydrr.org/sullivan/rider/Sullivan-Psych-201-Std-Dev%20with%20Excel.pdf