NO.PZ2015120604000044
问题如下：
Annual return of the stock of Stone Company are showing below.
According to the above table, calculate the arithmetic mean return for Stone's stock.
选项：
A.
5.17%.
B.
6.00%.
C.
6.77%.
解释：
A is correct
[10% + 15% + (-8%) +12% + (-6%) +8 %] / 6 = 5.17%
计算收益为什么不用几何平均数计算呢？
