What is the probability of an event not happening called?

What is the probability of an event not happening called?

• A. Complement of an event
• B. Theoretical probability
• C. Outcome
• D. Probability

Answer: (A)

The probability of an event not happening is called its complement. The complement includes all the outcomes where the event does not occur, and together with the event itself, they add up to 1. If the event has probability P, then the probability of it not happening is 1 − P. For example, if there’s a 0.70 chance of rain, the chance it does not rain is 0.30. The other ideas describe different things: theoretical probability is a way to calculate likelihood, the outcome is the actual result observed, and probability is the general measure of how likely something is.

The probability of an event not happening is called its complement. The complement includes all the outcomes where the event does not occur, and together with the event itself, they add up to 1. If the event has probability P, then the probability of it not happening is 1 − P. For example, if there’s a 0.70 chance of rain, the chance it does not rain is 0.30.

The other ideas describe different things: theoretical probability is a way to calculate likelihood, the outcome is the actual result observed, and probability is the general measure of how likely something is.