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How to calculate standard deviation in Excel?

In statistics, standard deviation is usually used for measuring the dispersion from the average. But in fact, to calculate standard deviation is a little complex, you need to get the average first, and then calculate the difference of each data point from the mean, and square the result of each and so on. The equation of standard deviation in Math or Statistics is shown as following:

doc-standard-deviation

Now I will tell you a formula in Excel to quickly get the standard deviation of a data range.

Calculate standard deviation in Excel


arrow blue right bubble Calculate standard deviation in Excel

In Excel, it has a standard deviation can help you get the result at once.

Please select a blank cell and type this formula =STDEV(A1:A6) into it, then press Enter key on the key board, now you get the standard deviation of the data range from A1 to A6.


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how do you get 2 standard deviations?
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