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Standard deviation
描述
In statistics, the standard deviation (SD, also represented by the Greek letter sigma, σ for the population standard deviation or s for the sample standard deviation) is a measure that is used to quantify the amount of variation or dispersion of a set of data values.
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Read more here: https://en.wikipedia.org/wiki/Standard_deviation
Watch similar videos here: http://www.dailymotion.com/playlist/x42ka6_wikivideos_mathematics
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