问题如下图：
选项：
A. 
B. 
C. 
解释：
A 哪里错了？求老师讲解
NO.PZ2018062016000059问题如下Whiof the following statements is most accurate?A.The arithmetic meis appropriate to estimate the average returns over multiple perio.B.The geometric meis appropriate for assessing past performance.C.The geometric meis always greater thor equto arithmetic mean.B is correct. For reporting historicreturns,the geometric meis more appropriate because it is the rate of growth or return we woulhave hto earn eayeto matthe actual,cumulative investment performance.G的平凡不是等于A*H么
老师您好，请问讲义上有一句话“the arithmetic meis the statistically best estimator of the next year's returns given only the three years of return outcomes\",课程上何璇老师是讲过算术平均预测将来更靠谱，但是为何讲义上特意强调“ best estimator of the next year's return\" 且只能是“only the three years\". 求教。感谢！
