SOLUTION: In order to earn an A in a class, your test scores must average at least 92%. On the first 6 tests, you have an average of 91%. What score do you need to get on the last test to ea
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Question 420085: In order to earn an A in a class, your test scores must average at least 92%. On the first 6 tests, you have an average of 91%. What score do you need to get on the last test to earn an A? Show your work.
Well I tried it myself And I think it's set out like this: 91+6=>92 I don't know If this is the right way to set it up. =/ Found 3 solutions by stanbon, josmiceli, Edwin McCravy:Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! In order to earn an A in a class, your test scores must average at least 92%. On the first 6 tests, you have an average of 91%.
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Total points on those 6 tests = 6*91 = 546
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What score do you need to get on the last test to earn an A?
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Let the final test score by "x":
Solve for "x" when (546+x)/7 >= 92
546 + x >= 7*92
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x >= 98
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Cheers,
Stan H.
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You can put this solution on YOUR website! You need the definition of an average. It is:
Average of data samples = (sum of data samples) / (number of samples)
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Lety the score of the last test =
You need a 98%
Having an average of 91 on 6 tests is the same as making exactly
91 of all 6 tests. So we will pretend that you made 91 on each
of the first 6 tests:
1. On the 1st test you made 91
2. On the 2nd test you made 91
3. On the 3rd test you made 91
4. On the 4th test you made 91
5. On the 5th test you made 91
6. On the 6th test you made 91
7. On the 7th test you made x.
91 + 91 + 91 + 91 + 91 + 91 + x
Average = --------------------------------- > 92
7
546 + x
--------- > 92
7
546 + x > 644
x > 98
You need to make at lease 98
Edwin
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