Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 4 - Probability and Counting Rules - 4-1 Sample Spaces and Probability - Exercises 4-1 - Page 199: 28


a. $0.295$ b. $0.419$ c. $0.093$

Work Step by Step

The number of total schools is 83057 a. 50 or fewer computers There are 24501 schools with 50 or fewer computers, so the probability is $p=\frac{24501}{83057}=0.295$ b. More than 100 computers There are 34803 schools with more than 100 computers, so the probability is $p=\frac{34803}{83057}=0.419$ c. No more than 20 computers There are 7760 schools with no more than 20 computers, so the probability is $p=\frac{7760}{83057}=0.093$
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