Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 4 - Section 4.2 - Compound Inequalities - Exercise Set - Page 274: 73



Work Step by Step

Consider the average of all the scores. $80 \leq \dfrac{70+75+87+92+x}{5} \lt 90$ This implies $(80)(5) \leq 324+x \lt (90)(5)$ or, $400 \leq 324+x \lt 450$ or, $76 \leq x \lt 126$ Our result is: $[76,126)$
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