The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
3方差的专业定义是随机变量的二次中心矩,与期望值之差的平方的加权平均值。
The average size is 3,131 square feet, with a standard deviation of 655 square feet. (Standard deviation is a statistical measure of variance.)
平均大小为 3,131 平方英尺,标准偏差为 655 平方英尺(标准偏差是一个描述差异的统计量度)。
The standard deviation is the square root of the variance.
标准差是方差的平方根。
The standard deviation is the square root of the variance.
标准差是方差的平方根
What we want to do now is compute the mean and variance of the portfolio-- or the mean and standard deviation, since standard deviation is the square root of the variance-- for different combinations of the portfolios.
我们现在要做的是,计算这个投资组合的均值和方差-,或者均值和标准差,因为标准差的平方就等于方差-,这对任何投资组合都是一样的。
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