College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 8 - Summary, Review, and Test - Review Exercises - Page 790: 84



Work Step by Step

We know that $probability=\frac{\text{number of favourable outcomes}}{\text{number of all outcomes}}$ The total number of students (the number of all outcomes) is $350$ By using the table, there are $140$ low income and $160$ middle income families, thus there are $140+160=300$ non-high income families. Hence the probability here is: $\frac{300}{350}=\frac{6}{7}$
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