According to the meaning of the question, the average score of eight people such as B is 88 (except the highest score, the average score of other students is 88), so the sum of the scores of eight people such as B is b+c=88×9=792.
According to the meaning of the question, the average score of eight people such as A is 9 1 (except the lowest score, the average score of other students is 9 1), so the sum of the scores of eight people such as A is a+c=9 1×9=8 19.
So the difference between the highest score and the lowest score is a-b = (a+c)-(b+c) = 819-792 = 27.
The difference between the highest score and the lowest score is 27 points.