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.
Let $\EE$ be an experiment.
Let $\Pr$ be the probability measure of $\EE$.
Then the probability of $A$ is the value $\map \Pr A$.
Also denoted as
Some sources denote the probability of an event $A$ as $\map P A$.
Some denote it $P \sqbrk A$.
Amongst the non-mathematically-literate of the world's population, a common form of rhetorical emphasis (usually used when asserting a falsehood of a personal and delicate nature) is to state a greater-than-$100 \%$ probability of an event.
A typical example of this could be seen on the Maury Povich Show, as follows:
- Euniquea: I am five hundred thousand percent certain that Twyvone is the father of mah bay-bee ...
- Maury Povich: Twyvone ... you are naaht the father.