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

Algebra ->  Test -> 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      Log On


   

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) About Me  (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