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Relative frequency

Suppose the trial is repeated

n

times, and in

m

of them event

A

occurred. The relative frequency (often denoted

W_n(A)

or similar): $W=\dfrac{m}{n}.$ This is a fact about a series of trials, not a “pure model”: in a new series the number

m

usually changes.

For large

n

the frequency often fluctuates around the theoretical

P(A)

, if the model is adequate

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