Ontario Mathematics Proficiency Practice Test

Question: 1 / 400

What does complementary probability refer to?

The probability of an event occurring

The probability of an event not occurring

Complementary probability specifically refers to the probability of an event not occurring. In probability theory, every event has an associated complementary event, which includes all outcomes that are not part of the original event. The probability of the complementary event can be calculated by subtracting the probability of the event from 1. This relationship is grounded in the concept that the total probability of all possible outcomes must equal 1.

For example, if the probability of an event happening is 0.7, the complementary probability, or the probability of the event not happening, would be 1 - 0.7 = 0.3. This definition is crucial as it helps in determining outcomes and calculating probabilities for various scenarios in statistics and probability studies.

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The probability of multiple independent events

The combined probability of all possible outcomes

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