SOLUTION: An instructor has graded 22 exam papers submitted by students in a class of 23 students, and the average so far is 68. (The maximum possible score is 100.) How high would the score
Algebra.Com
Question 1107373: An instructor has graded 22 exam papers submitted by students in a class of 23 students, and the average so far is 68. (The maximum possible score is 100.) How high would the score on the last paper have to be to raise the class average by 1 point?
2 points?
Answer by ikleyn(52776) (Show Source): You can put this solution on YOUR website!
.
= 69.
Solve for x.
I do not explain why it is so, because I think the formula itself displays it.
You only need to read it.
---------------
On this sort of problems see the lesson
- Solved problems on average scores, weight, height and temperature
in this site.
RELATED QUESTIONS
An instructor has graded 23 exam papers submitted by students in a class of 24 students,... (answered by stanbon)
An instructor has graded 32 exam papers submitted by students in a class of 33 students,... (answered by swincher4391)
An instructor has graded 28 exam papers submitted by students in a class of 29 students,... (answered by stanbon)
An instructor has graded 33 exam papers submitted by students in a class of 34 students,... (answered by stanbon)
In a large class, 80 students took a test. When the test papers were graded, it was founf (answered by akmb1215)
17 students in a class average 92% and 8 students average 84% on the same math exam, what (answered by mark_henrhiz)
A class with 12 students has an average exam score 75 and another class with 15 students... (answered by TutorDelphia)
In a class that has 375 students, the average on an exam was exactly 55.15. If all... (answered by KMST)
Make-up exam: In a class of 25 students, 24 of them took an exam in class and 1 student... (answered by ikleyn)