NO.PZ2022123001000049
问题如下：
The following information is available for a portfolio:
The return on the portfolio is closest to:
选项：
A.10.0%
B.8.2%
C.10.8%
解释：
The portfolio return is the weighted mean return and is calculated as follows:
请问后面的这个相关系数是用来干嘛的？感觉有点混淆视听
