Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Entry-Level Assessment - Multiple Choice - Page xl: 28


H; $98$

Work Step by Step

For the average of your five scores to be $90$, add them together and divide by $5$. Since we do not know the score of your fifth test yet, we can set up an equation to see what you need to get on it to have an average score of $90$. $\frac{78+85+97+92+x}{5}=90$ $\frac{352+x}{5}=90$ Multiply both sides of the equation by $5$. $352+x=450$ $x=450-352$ $x=98$ You will need to score a $98$ to have an average of $90$ on the five exams.
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