If the probability of rain is 0.25, what is the probability of not raining?

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Multiple Choice

If the probability of rain is 0.25, what is the probability of not raining?

Explanation:
The main idea here is the complement rule: the probability of the opposite outcome equals 1 minus the probability of the event. If rain happens with probability 0.25, then not raining is 1 − 0.25 = 0.75, which is 75%. Since either it rains or it doesn’t, these two possibilities sum to 1.0. So the probability of not raining is 0.75 (three quarters).

The main idea here is the complement rule: the probability of the opposite outcome equals 1 minus the probability of the event. If rain happens with probability 0.25, then not raining is 1 − 0.25 = 0.75, which is 75%. Since either it rains or it doesn’t, these two possibilities sum to 1.0. So the probability of not raining is 0.75 (three quarters).

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