Question

there is a 60% chance of rain for a given day. what is the chance that it will not rain?

a. 60%
b. 40%
c. 0%
d. 100%

Explanation:

Step1: Recall probability rule

The total probability of all possible events is 100%. The events "rain" and "no - rain" are complementary.

Step2: Calculate no - rain probability

Subtract the probability of rain from 100%. So, $100\% - 60\%=40\%$.

Answer:

B. 40%