Question 951112
To have a mean score of 75% on 9 tests, the sum of the scores must be 9(75)=675.
The sum of 8 scores with mean 72%= 8(72)=576
So to have a mean score of 75%, she must score (675-576)=99.
To finish with a mean score of 75%, the student must score 99% on the final test.