Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1-5 - Cumulative Review - Page 372: 36


She needs at least a 9.

Work Step by Step

We know that the equation for average is the sum of the scores over the number of quizzes. Thus, letting $x$ be the score she needs on the last quiz, we find: $$ \frac{\left(8+3+5+10+x\right)}{5}=7\\ x+26=35\\ x=9$$
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