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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 ...

www.khanacademy.org/math/probability/data-distributions-a1/summarizing-spread-distributions/a/calculating-standard-deviation-step-by-step

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.

www.ask.com/youtube?q=Standard+Deviation&v=MRqtXL2WX2M
Apr 5, 2015 ... Video transcript: "Have we discovered a new particle in physics? Is a manufacturing process out of control? What percentage of men are taller ...

mathworld.wolfram.com/StandardDeviation.html

Physical scientists often use the term root-mean-square as a synonym for standard deviation when they refer to the square root of the mean squared deviation of ...