![]() Standard deviation takes a range of data and determines how far each value is separated from the average of the total. ![]() Phrases like standard deviation put fear into the hearts of nervous mathematicians worldwide, but the concept is pretty simple. To help you work out how to use standard deviation in Excel, we'll explain how to use it in this step-by-step guide. STDEV and its related functions allow you to determine the standard deviation of a data sample or data set, measuring the variation between those numbers against the average.
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