平方平均数
quadratic mean (root mean square) The square root of the arithmetic mean of the squares of a set of numbers, i.e., $\sqrt{\frac{a_1^2 + a_2^2 + \cdots + a_n^2}{
CSCA 数学 考试术语
quadratic mean (root mean square) The square root of the arithmetic mean of the squares of a set of numbers, i.e., $\sqrt{\frac{a_1^2 + a_2^2 + \cdots + a_n^2}{
CSCA 数学 考试术语