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en.wikipedia.org/wiki/Standard_deviation

In statistics, the standard deviation is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation  ...

www.mathsisfun.com/data/standard-deviation.html

The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma). The formula is easy: it is the square root of the ...

Interestingly, in the real world no statistician would ever calculate standard deviation by hand. The calculations involved are somewhat complex, and the risk of ...

www.robertniles.com/stats/stdev.shtml

A simpler explanation of standard deviation, written by a former math-major- turned-journalist who likes to explain math to people don't understand or just plain ...

www.investopedia.com/terms/s/standarddeviation.asp

Standard deviation is a measure of the dispersion of a set of data from its mean. It is calculated as the square root of variance by determining the variation ...

www.calculator.net/standard-deviation-calculator.html

Free online tool to calculate the standard deviation, variance, mean, sum, and confidence range for given numbers, along with hundreds of other free ...

www.statisticshowto.com/probability-and-statistics/standard-deviation

Oct 25, 2017 ... Standard deviation explained in plain English. How to find it by hand or using technology. Standard deviation symbol. Step by step examples.