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 ->  Numeric Fractions Calculators, Lesson and Practice -> 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 336575: 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
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the score for her fourth test,
%2887%2B81%2B88%2BX%29%2F4=87
256%2BX=348
highlight%28X=92%29