Problema Solution
A student has four major tests each quarter. To date she has received the following grades: 81, 93, 87. She wishes to end the quarter with at least a 89 average. What is the lowest score she can get on the fourth test to end with a 89% average?
Answer provided by our tutors
Average of 4 tests = (81+93+87+X)/4 where X = score of 4th test must be 89 or more.
Let Average = 89. Then X = 4*89-81-93-87= 95 %