SOLUTION: Sandra's scores on the first test were 81, 92, 76, and 89.
What is the minimum score Sandra needs to make on the fifth test so that her mean test score is at least 80? Explain.
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-> SOLUTION: Sandra's scores on the first test were 81, 92, 76, and 89.
What is the minimum score Sandra needs to make on the fifth test so that her mean test score is at least 80? Explain.
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Question 612856: Sandra's scores on the first test were 81, 92, 76, and 89.
What is the minimum score Sandra needs to make on the fifth test so that her mean test score is at least 80? Explain. Answer by unlockmath(1688) (Show Source):
You can put this solution on YOUR website! Hello,
Getting A's in math depends on one thing---Understanding the words and symbols.
"Mean" is the average.
So we set this up as:
(81 + 92 + 76 + 89 + x)/5 >= 80
Multiply both sides by 5 to get:
(81 + 92 + 76 + 89 + x) >= 400
Subtract 338:
x=62
There we go. Sandra needs to get at least 62 on the test.
Make sense?
RJ
www.math-unlock.com
