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How to find the variance and standard deviation of junior high school mathematics?
If the variance is x 1, then the average of x2 and x3 ... xn is m.

Variance S2 =1/n [(x1-m) 2+(x2-m) 2+...+(xn-m) 2].

Variance is the average deviation from square, which is called standard deviation or mean square deviation. Variance describes the degree of fluctuation.

Standard deviation

Root sign of variance