The standard deviation is the square root of the variance.
标准差是方差的平方根。
Find range, interquartile range, variance and standard deviation for a data set.
全距，四分位距，方差和标准差。
The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
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