NO.PZ202106160300003003
问题如下：
The harmonic mean return over the 10 years is closest to:
选项：
A.2.94%
B.2.97%
C.3.00%
解释：
A is correct.
The harmonic mean return = (n/Sum of reciprocals)-1 = (10 /9.714) -1 = 2.9442%
請問這個題有計算機比較快的算法嗎？謝謝
NO.PZ202106160300003003 问题如下 The harmonic mereturn over the 10 years is closest to: A.2.94% B.2.97% C.3.00% A is correct. The harmonic mereturn = (n/Sum of reciprocals)-1 = (10 /9.714) -1 = 2.9442% harmonic mean的公式分母不是1/return吗？怎么这道题是1/（1+return）？
NO.PZ202106160300003003 同问，什么时候该用1+return
