SOLUTION: Aldo has scored 84,72,85, and 92 on his previous tests. What score does he need on his next test so that his average (mean) is 85

Algebra ->  Average -> SOLUTION: Aldo has scored 84,72,85, and 92 on his previous tests. What score does he need on his next test so that his average (mean) is 85      Log On


   

Question 986479: Aldo has scored 84,72,85, and 92 on his previous tests. What score does he need on his next test so that his average (mean) is 85
Found 2 solutions by solver91311, macston:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Presuming all tests are of equal weight, in order to have a final average of 85 for 5 tests, then the total points scored for all 5 tests must be 85 times 5 or greater. Add up the scores of the first four tests and subtract that total from 85 times 5 to find the score required for the last test.

John

My calculator said it, I believe it, that settles it

Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
.
To average 80 over 5 tests, the sum of the tests scores must be:
(5)(85)=425
.
Aldo's current sum:
84+72+85+92=333
.
Aldo needs:
425-333=92
.
ANSWER: Aldo must score 92 to have an average of 85.