# Relative frequency

“a” be number of times event A has occurred among the n reptitions, a / n is relative frequency.

$$f_{A} = \frac{n_{A}}{n}$$

$$f_{A}$$ = 1 iff A occurs every time among n repetitions.

$$f_{A}$$ = 0 iff A does not occur at all.

As experiment is repeated more times, $$f_{A}$$ stabilizes.