Answer: 54 points
Explanation:
To find the score, we must first find the sum of the first eight scores by multiplying the average with the number of subjects so that is 72 × 8 = 576, now to find the sum of the nine scores, we can use the same way we used with the eight scores which is avg. × amount = 70 × 9 = 630, now take 576 and subtracting from 630 to get 630 - 576 = 54