Find the weighted average of the exams

Question

There are 350 possible points in your philosophy class. These points come from 5 homework sets, each worth 10 points, and 3 exams, each worth 100 points. A student has the following homework scores: 4,8,7,7, and 9. This same student earned a 78 and an 83 on the first two exams.

 

A.) let s represent the student's score of the final exam. Provide a symbolic rule for the students final percentage score,f.

      I did this part--h+e+s/p=f   h=homework score e=exam scores (first 2) s=students score of final exam p=possible points in the class and f=students final percentage score

 

B.)A score of at least at 90% is needed for an A. It is possible for this student to earn an A?--No, even if the student scored a 100 percent on the exam it still wouldn't be enough to get an A.

 

C.) What is the minimum score the student must earn on the final exam to earn a final grade of a B? Note that you need at least an 80% to earn a B.--84% is the minimum score a student can earn

 

D. Note: this could be viewed as a weighted average. What is the weight of the exams?

                ( NEED HELP WITH THIS)

 

Answer 1

A weighted average is an average where some scores are more important, or carry more weight, than others.  In this case, the weighting factor for each score is the amount of points available for that score, divided by the total number of points available.  

 

So the weight of any single exam is (100/350), which is 2/7, or about 28.6%

 

The weight of all 3 of the exams together is (300/350), which is 6/7, or about 85.7%