股票数目n

1

2

3

4

5

6

7

8

9

方差

9.382

5.094

3.531

2.896

2.636

2.435

2.312

1.961

1.958

股票数目n

10

11

12

13

14

15

16

17

18

方差

1.836

1.836

1.833

1.833

1.833

1.833

1.832

1.832

1.832