NO.PZ2015120604000058
问题如下:
The returns of the an investor'investment over past 3years are 7%, 8%,9% Calculate the harmonic mean of the return. .
选项:
A.8.0.
B.7.92.
C.2.64.
解释:
B is correct
The harmonic mean
老师能解释一下为什么是除以7,不是1.07吗?
辛苦啦!谢谢老师们,比心!