# Chapter 4 - Probability and Counting Rules - 4-1 Sample Spaces and Probability - Exercises 4-1 - Page 198: 9

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.

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.