20.0 20.0 ; 0.03 0.04 A

24.55 24.5 25 mode

56 1.2 1.2 2

From high to low 7 2 3 8 5 1 6 4

No.7 player

Player 3

Player 2

The average value of a is10; The variance of a is 0.02; B is 0.005.

Machine tool b is more in line with the requirements.