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20 13 Jiangnan No.10 Middle School Entrance Examination for Mathematics
According to the histogram of frequency distribution, we can get

The average math score of students in this school is

. x =(80×0.0 1+ 100×0.025+ 120×0.0 1+ 140×0.005)×20 = 104；

The estimated value of the model is 90+1102 =100.

So choose: C.

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    Small class teaching plan number 1 1 1

    Activity purpose:

    1, knowing number 5, energy point 5.

    2. Learn one to one, and the

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