SOLUTION: Ella�s test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean test score of 90?

Question 983622: Ella�s test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean test score of 90?
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Ella�s test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean test score of 90?
Solution:
Let x = Ella's last score
We want
Multiply both sides by 6
89 + 94 + 82 + 84 + 98 + x = 540
447 + x = 540
x = 93
Answer:
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