-5.35是怎么算出来的？
我用ending price*share outstanding 算出每个security的mkt value 权重，再乘以每个Security的total return，没有算出-5.35。能看下详细过程吗
An analyst gathers the following information for a market-capitalization-weighted index comprised of securities MNO, QRS, and XYZ:
The total return of the index is:
