Current location - Training Enrollment Network - Mathematics courses - The following table is a statistical table of the results of a math test conducted by 20 students in Class 8 (1) of a school:
The following table is a statistical table of the results of a math test conducted by 20 students in Class 8 (1) of a school:
(1) According to the meaning of the question:1+5+x+y+2 = 20 60×1+70× 5+80x+90y+100× 2 = 82× 20.
Sorted: x+y= 12 8x+9y= 103.
The solution is x=5 y=7.
A: x=5, y = 7；;
(2) According to (1), a=90 and b=80.
A: Most of them are 90 points, and the median is 80 points.