SOLUTION: Zachary has scores of 91,89,84 on his first three algebra test
What score does he need on his fourth test in order
to have a mean score of exactly 90 on his four algebra
Algebra.Com
Question 664315: Zachary has scores of 91,89,84 on his first three algebra test
What score does he need on his fourth test in order
to have a mean score of exactly 90 on his four algebra
Found 2 solutions by ReadingBoosters, lynnlo:
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Average is the (sum of the numbers)/(the # of numbers)
Given 3 numbers and the average, plug them into the equation, where x is the unknown 4th score
...
(91 + 89 + 84 + x)/4 = 90
Solve for x
Combine like terms
(264 + x)/4 = 90
Multiply by 4
264 + x = 360
Isolate x
x = 360 - 264
x = 96
...
Zachary must score a 96
.........................
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Answer by lynnlo(4176) (Show Source): You can put this solution on YOUR website!
score 96
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