The theme of statistical probability is to enrich students’ extracurricular life and guide students to read more, be good at reading, and read well. Chongqing No. 1 Middle School hired a professor fro

The theme of statistical probability is to enrich students’ extracurricular life and guide students to read more, be good at reading, and read well. Chongqing No. 1 Middle School hired a professor from Southwest Normal University to teach "Poetry"

(1) According to the meaning of the question, combining the fan chart and the bar chart, 540 people participated in the first grade of high school, accounting for 45%, and ***540÷45%=1200 people,

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Furthermore, we can get that the third year of high school has 240÷1200×100%=20%,

the second year of high school accounts for 1-45%-20%=35%;

So the answer It is 1200, 35%, 20%.

(2)

(3) There are 1 first prize, 3 second prizes, 6 third prizes, and m commemorative prizes,

< p> Then: 103×520×6+m?2=570

2m=200

m=100

∴This event The probability of winning is: 1+3+6+100 1200 = 110 1200 = 11 120 (10 points)