In the sample of (1), the average score of students' math scores can be calculated by (100× 94+80× 90) ÷ (100+80);

(2) With 40%× 180, we can get the frequency of math scores in 84-96, and the number of A-level students is 63, and the total number is 180, then the percentage of A-level students in the total number of sampled students can be calculated with 63÷ 180; According to the characteristics of the median, the fractional segment where the median is located can be obtained.