论文部分内容阅读
方差是刻画一组数据离散程度的统计量,是一组数据中各个数据与平均数之差的平方的平均数,能反映一组数据的波动程度.它的计算公式为
Variance is the statistic that describes the degree of dispersion of a group of data. It is the average of the square of the difference between each data and the average in a group of data. It can reflect the fluctuation of a group of data. Its formula is