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mean, median and mode

by Nicolas
(Canada)











































A student has a mean average score of 85% after completing 4 tests. What is the lowest possible percent score in any one of the tests?

How do I solve this?

Comments for mean, median and mode

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Sep 16, 2010
Arithmetic Average
by: Staff


The question:

by Nicolas
(Canada)


A student has a mean average score of 85% after completing 4 tests.

What is the lowest possible percent score in any one of the tests?

How do I solve this?



The answer:


The mean is simply the average of all 4 test scores.

Mean (or average) = (test 1 + test 2 + test 3 + test 4)/4 = 85

The lowest score possible occurs when the 3 good scores are highest.

The highest score possible is 100.

If x = lowest score possible:



(100 + 100 + 100 + x)/4 = 85

[(100 + 100 + 100 + x)/4] * 4 = 85 * 4

100 + 100 + 100 + x = 340
300 + x = 340

300 – 300 + x = 340 - 300

x = 40

The final answer is: the lowest test score possible is 40%.






Thanks for writing.


Staff
www.solving-math-problems.com


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