$B_2$

$C_{21}$

$C_{22}$

$C_{23}$

$C_{24}$

$C_{25}$

权数

$C_{21}$

1

1/5

1/5

01/3

1

0.0595

$C_{22}$

5

1

3

5

5

0.4618

$C_{23}$

5

1/3

1

3

7

0.2874

$C_{24}$

3

1/5

1/3

1

5

0.1411

$C_{25}$

1

1/5

1/7

1/5

1

0.0502