## Intermediate Algebra for College Students (7th Edition)

$[76,126)$
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: $[76,126)$