The median age of ∴ is 85,
The average score of Class Two in Grade Three is: (70+75+80+100+100) ÷ 5 = 85 (3 points each).
(2) The average scores of the top three players in Class 3 (1) and Class 3 (2) are 9 1.7 and 93.3 respectively.
∴ Choose 3 semi-finalists from each class to participate in the final, and Class 3 (2) is stronger. (4 points)