平均值(Mean)、方差(Variance)、标准差(Standard Deviation)

http://blog.shaochuancs.com/mean-variance-sd/


方差

https://en.wikipedia.org/wiki/Variance#Product_of_independent_variables

方差通常以这三种形式表示:\sigma ^{2} , s^{2} , Var(X)

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转载自blog.csdn.net/infinita_LV/article/details/82753632