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: 9

Answer

0.80 I would not recommend taking an umbrella

Work Step by Step

If the probability that it will rain tomorrow is $0.20$, the probability that it wont rain tomorrow is $1-0.20=0.80$ I would not recommend taking an umbrella as the probability of occurrence of rainfall is only 20 percent. This means that it is fairly certain that rain wont occur.
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