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What is the Algebra equation?
What is the algebraic equation for this problem?
A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test?
A. 85
B. 86
C. 87
D. 92
E. 93
7 Answers
- ranjankarLv 710 years ago
Average 87 in 4 tests means a total of 87 X 4 = 348
87 + 81 + 88 = 256
348 - 256 = 92
ANSWER is D
- D. OnesLv 410 years ago
Arithmetic Mean = (All test scores added up)/(# of test scores)
There are four test scores
Use x for the fourth test score.
Therefore, we have (87 + 81 + 88 + x)/4 = 87
That's your equation.
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- Anonymous10 years ago
try counting each answer at a time to the scores u already know and then divide by four (i'm a good person so i wn't give u the answer good luck)
