# Category:Definitions/Probability

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This category contains definitions related to Probability.

Related results can be found in Category:Probability.

### Informal Definition

The **probability** of an event is the likelihood that the event will occur (within a certain formally or informally understood context).

As such, a **probability** can range from $0$ (will never happen) to $1$ (is certain to happen).

Commonly, a **probability** is often stated in terms of a percentage.

### Formal Definition

Let $\EE$ be an experiment.

Let $A \in \Sigma$ be an event in the event space $\Sigma$ of $\EE$.

Let $\Pr$ be the probability measure of $\EE$.

Then the **probability** of $A$ is the value $\map \Pr A$.

## Pages in category "Definitions/Probability"

The following 4 pages are in this category, out of 4 total.