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Math group 1
Your answer is correct.

For illustration, if the average grade of the whole class is 80 (which can also be regarded as X), the total score of the first group is15× 4+15× 80 =1260, or (80+4) ×15 =/kloc-0. Indeed, the average score of the first group is 4 points higher than the average score of the class, which is actually 4× 15=60 points more.

Similarly, the total score of the second group is (80-2) ×13 =10/4, and the second group is 2× 13=26.

The calculation principle of other groups is similar.

In your calculation,15× 4+13× (-3)+14× (-2)+12×1= 60-39-28+/kloc-.

The average score of the fifth group is 5 points, which means that the average score is lower than the class average.