SOLUTION: the mean grade on 4 test is 78%. can the mean be raised to 85% with one more test?

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: the mean grade on 4 test is 78%. can the mean be raised to 85% with one more test?      Log On


   

Question 794537: the mean grade on 4 test is 78%. can the mean be raised to 85% with one more test?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
the mean grade on 4 test is 78%. can the mean be raised
to 85% with one more test?
========
Equations:
Total points from 1st 4 tests = 4*78 = 312
---------
Total points needed on 5 tests = 5*85 = 425
-------
Points needed on the 5th test = 425-312 = 113
====================
Ans: 113 points cannot be gotten on one 100 point test.
====================
Cheers,
Stan H.
===============