Three 100 point tests, scored 83,89,92 on them. What range of scores on the fourth test be for an average of 90 on all 4 tests?

Question

If Briann took three 100 point tests and scored 83, 89, and 92 on them, what range of scores on the 4th test would give her an average of at least 90 on the 4 tests?

Answer 1

(83+89+92+x)/4 ≥ 90

 

264 + x ≥ 360

 

x ≥ 96

 

Any score of 96 or higher will give an average of at least 90