# 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?

##### 1 Answer

Jul 6, 2016

#### Answer:

She must earn a score of

#### Explanation:

To have an average of

if we call the 4th test results

then