The average of Molly's 5 quiz scores is 9.0. If her highest test score is dropped, her average is lowered to 8.5. What was her highest test score?

1 Answer
Aug 25, 2016

11

Explanation:

We want to know her highest quiz score so let that be #x#
The total of the 5 scores is 5x9 =45
The total without the highest is 45-#x#
The average without the highest is #(45-x)/4=8.5#
Solve to get the answer

Of course the question is only answerable when we are talking about the mean average.