算术平均值(A)≥几何平均值(G)≥调和平均值(H)
.
[注:可按照字母表的顺序记忆,字母A排在最前,字母G排在中间,字母H排在最后.如果一组数据完全相等,那么这3个平均值相等.]
[Practice 2.5]答案及解释在本章内
If the standard deviation of returns in a sample is not equal to zero, the arithmetic mean is:
A. less than the geometric mean, and less than the harmonic mean.
B. less than the geometric mean, bu