20 15 Jiangnan No.10 middle school entrance examination mathematics - Training Enrollment Network

20 15 Jiangnan No.10 middle school entrance examination 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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