Junior high school applied mathematics competition</p><p>(1) Sample size = 100÷2=500, then the third group frequency = 500-50-100-200-25 =125, and the figure is a supplement.</p><p>(2)∵ Median is the

Junior high school applied mathematics competition

(1) Sample size = 100÷2=500, then the third group frequency = 500-50-100-200-25 =125, and the figure is a supplement.

(2)∵ Median is the

Junior high school applied mathematics competition

(1) Sample size = 100÷2=500, then the third group frequency = 500-50-100-200-25 =125, and the figure is a supplement.

(2)∵ Median is the average of the sum of the 250th and 25 1 data arranged from small to large.

The first three groups of frequencies are 50, 100 and 125 respectively.

∴ The median sample belongs to the third group;

(3)∵ 10000× 25 500 =500,

It is estimated that there are 500 winners among the third-grade students in this county.