SOLUTION: If i Have 5 test each worth 100% and so far I have taken 4 out of the 5. The first test score was 65%, the second test score was 57%, the third and the fourth were 80%. What would

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: If i Have 5 test each worth 100% and so far I have taken 4 out of the 5. The first test score was 65%, the second test score was 57%, the third and the fourth were 80%. What would       Log On


   

Question 463500: If i Have 5 test each worth 100% and so far I have taken 4 out of the 5. The first test score was 65%, the second test score was 57%, the third and the fourth were 80%. What would I need to get on the 5th(last) test to have a C or B in the class?
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = the minimum score needed on the last test to get a C.
If 70% is considered a C grade, then
Average grade = 0.7 = (0.65+0.57+0.8+0.8+x)/5
Solve for x:
3.5 = 2.82 + x
x = 0.68
Therefore, the minimum grade is 68%.