NO.PZ2023052302000004
问题如下：
A portfolio manager invests EUR5,000 annually in a security for four years at the following prices:
The average price is best represented as the:
选项：
A.
harmonic mean of EUR76.48
B.
geometric mean of EUR77.26
C.
arithmetic average of EUR78.00
解释：
A is correct. The harmonic mean is appropriate for determining the average price per unit as it gives equal weight to each data point and reduces the potential influence of outliers. It is calculated as follows:
如果A适用于average cost strategy，那么B和C分别适用什么场景？我还是不太理解调和平均数适用于平均成本策略这个说法，怎么样理解才好？
