law averages

law of averages

noun
1.
a statistical principle formulated by Jakob Bernoulli to show a more or less predictable ratio between the number of random trials of an event and its occurrences.
2.
Informal. the principle that, in the long run, probability as naively conceived will operate and influence any one occurrence.
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law of averages
 
n
Compare law of large numbers (popularly) the expectation that a possible event is bound to occur regularly with a frequency approximating to its probability, as in the (actually false) example: after five heads in a row the law of averages makes tails the better bet

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