- An experiment is a process with an uncertain result.
- An outcome is a possible result of an experiment.
- An event is a set of one or more outcomes.
Probabilities are assigned on a scale from \(0\) to \(1\):
- \(0\) means impossible
- \(1\) means certain
If one object is chosen at random from \(n\) objects, then:
\[
P(\text{selecting any particular object})=\frac{1}{n}
\]
If outcomes are equally likely, then:
\[
P(\text{event})=\frac{\text{number of favourable equally likely outcomes}}{\text{total number of equally likely outcomes}}
\]