SOLUTION: An average score of 90 or above in an English course receives an A grade. A student has grades of 82, 83, 92, 96 on four tests. Find the range of scores on the fifth test that will

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Question 985299: An average score of 90 or above in an English course receives an A grade. A student has grades of 82, 83, 92, 96 on four tests. Find the range of scores on the fifth test that will give the student an A grade. (Let the maximum score on each test be 100. Enter your answer using interval notation.)
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
average=total/n
total=n*average
The total must be an average of 90*5 tests or 450.
The current tests add up to 353. The student needs a 97.
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Way 2
-8 on first test, -7 on second, +2 on third, +6 on 4th=-7 that has to be overcome. That means a 97 on the last test.