SOLUTION: 1. 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
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Question 596909: 1. 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
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Let x = fourth test score
(87+81+88+x)/4 = 87
87+81+88+x = 87*4
87+81+88+x = 348
256+x = 348
x = 348-256
x = 92
So the answer is choice D
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