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Calculate the mean of the scores of 20 s...

Calculate the mean of the scores of 20 students in a mathematics test

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We first, find the class marks `x_(i)` of each class and then proceed as follows

Therefore, `"mean"bar(x)=(sumf_(i)x_(i))/(sumf_(i))=(700)/(20)-35`
Hence, the mean of scores of 20 students in mathematics test in 35.
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