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Statistical probability

Relative frequency
Suppose the trial is repeated nn times, and in mm of them event AA occurred. The relative frequency (often denoted Wn(A)W_n(A) or similar): W=mn.W=\dfrac{m}{n}. This is a fact about a series of trials, not a “pure model”: in a new series the number mm usually changes.
For large nn the frequency often fluctuates around the theoretical P(A)P(A), if the model is adequate
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