SOLUTION: A pupil has a mean score of 72% from 8 tests. She has one more test to go and wants a mean score of 75%. What will she need to score in the final test?
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Question 951112: A pupil has a mean score of 72% from 8 tests. She has one more test to go and wants a mean score of 75%. What will she need to score in the final test? Answer by macston(5194) (Show Source):
You can put this solution on YOUR website! 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.
