The tenth student would need to earn 80% on the final exam so that the average final exam score for all 10 students is 75%.
We are given;
Number of students in class = 10 students
Final exam scores are: 68% 47% 81% 96% 91% 84% 61% 66% 76%
Thus, for one additional score to be added to get an average of 75% is;
(68% + 47% + 81% + 96% + 91% + 84% + 61% + 66% + 76% + x)/10 = 75%
670 + x = 75 * 10
x = 750 - 670
x = 80
The tenth student would need to earn 80% on the final exam so that the average final exam score for all 10 students is 75%.
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