sandy wrote:
Aaron’s first three quiz scores were 75, 84, and 82. If his score on the fourth quiz reduced his average (arithmetic mean) quiz score to 74, what was his score on the fourth quiz?
Another Approach:Since the average on 4 tests is 74
Let us see the difference between the overall average and each score
\(75 - 74 = 1\)
\(84 - 74 = 10\)
\(82 - 74 = 8\)
i.e. he has 19 surplus of 74, so we must subtract it from 74
\(74 - 19 = 55\)
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I hope this helps!
Regards:
Karun Mendiratta
Founder and Quant Trainer
Prepster Education, Delhi, Indiahttps://www.instagram.com/prepster_education/