If a final exam is worth 10% of ones grade, and one has so far a 75% in a class, then what percent must a person get on a final to get a 79% in a class?
2006-12-14 13:07:00 · 5 answers · asked by jon f 1 in Science & Mathematics ➔ Mathematics
If you need 4% over all (of 100%), you need to get 40% of the final test (worth 10%)
2006-12-14 13:20:49 · answer #1 · answered by Tom :: Athier than Thou 6 · 0⤊ 0⤋
If the final is worth 10% of the grade, the class grade is worth 90% of the grade. Then, let x be the necessary grade on the final
(0.9)(.75) + (0.1)x = 0.79
Solve for x
x = 1.15 .. that is, 115%. Are you sure your numbers are correct?
2006-12-14 21:20:18 · answer #2 · answered by need help! 3 · 1⤊ 0⤋
If you get 100% on the final, you will get a 81.1% in the class. It's the best one can do going into the final with a 75%.
2006-12-14 21:39:07 · answer #3 · answered by averagebear 6 · 1⤊ 0⤋
75*.9+.1*x=79
67.5+.1x=79
.1x=11.5
x=115
I thought so. I only did the problem because it seemed that need help! had gotten the wrong answer, since she got 115 and others got 11.5 . I was right to suspect, she did it right and the others were wrong ^_^ She's really smart.. So ya the answer's whatever she said.
2006-12-17 00:22:11 · answer #4 · answered by Maziar S 3 · 0⤊ 0⤋
11.5% or 1.15 out of ten
2006-12-14 21:21:49 · answer #5 · answered by Brian R 4 · 0⤊ 0⤋