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?
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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:
