Guess and Check #6

GC #7

GC #6 hints and answers

In a geometry course the grade is based on six tests, each worth 100 points. W. Orrier has an average of 88.5 on his first four tests. What is the lowest average he could obtain on his next two tests and still receive an overall average of 90 or better?

There are many approaches to this problem - one is to guess at what the answer might be, and then see whether your guess will make the final average grade bigger or smaller than 90. Then adjust your guess. One tricky thing here is to figure out how to calculate the overall average given the "averaged" data in the problem.

As always, be sure to explain the work you did to arrive at your answers!