After five tests Allison's average score was 88. After six tests her average score had increased to 90. What was her score on the sixth test? Show your work.

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04-01-2018
Mathematics

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After five tests Allison's average score was 88. After six tests her average score had increased to 90. What was her score on the sixth test? Show your work.

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LerenStudy LerenStudy · Answer 1 · 2018-01-04T06:27:29+01:00

My favorite thing to do in my pastimes in calculate what I can get on a final test to keep an average.

First, we have to find out what the total of the 5 tests was. This is done by multiplying the average score by 5 (because in calculating the mean/average, we would originally divided all the scores added up by the number of tests):
88*5 = 440

Then we have to do the following to find the average score (which we know already:
90= (440+x)/6
540=440+x
x=540-440
=100

Her score on the sixth test was 100