73.1k views
2 votes
Homework Avg.: 88Quiz Avg.: 84Test Avg.: 78Final Exam: ??If the teachers weights Homework at 20%, Quizzes at 20%, Tests at 40%, and the Final Exam at 20%, what is the minimum grade Kevin can make on the final exam so that she scores a 80 in the class?

1 Answer

1 vote

For this problem we know the following grades and the respective %

homework Avg: 88. 20%

Quiz Avg: 84. 20%

Test Avg: 40% 40%

Final Exam: X 20%

And we want to extimate the grade for the final exam in order to obtain an 80 for the class , so we can set up the following equation:


(88\cdot0.2)+(84\cdot0.2)+(78\cdot0.4)+(X\cdot0.2)=80

And we just need to find the solution for X, We can do some algebra first:


17.6+16.8+31.2+0.2X=80
0.2X=80-17.6-16.8-31.2

And finally we can divide both sides by 0.2 and we got:


X=(14.4)/(0.2)=72

Then the final answer for this case would be an 80 to get a final grade of 80

User FineTuneFork
by
8.8k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories