于同学2021-10-03 12:29:36

The annual returns for three portfolios are shown in the following exhibit. Portfolios P and R were created in Year 1, Portfolio Q in Year 2. Annual Portfolio Returns (%) Year 1 Year 2 Year 3 Year 4 Year 5 Portfolio P −3.0 4.0 5.0 3.0 7.0 Portfolio Q −3.0 6.0 4.0 8.0 Portfolio R 1.0 −1.0 4.0 4.0 3.0 The median annual return from portfolio creation to Year 5 for: A Portfolio P is 4.5%. B Portfolio Q is 4.0%. C Portfolio R is higher than its arithmetic mean annual return. 想问一下这道题（原版书p159第23题）的求解过程，谢谢！