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put this solution on YOUR website!The Average (arithmetic mean) of a student's scores on 4 tests was 77.
If he recieved a score of 69 on each of the first two tests and an 82 on the
third, what was his score on the fourth test?
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let x = fourth test score
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= 77
:
= 77
multiply both sides by 4
220 + x = 4(77)
x = 308 - 220
x = 88 on the 4th test
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