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Answers for “全概率定律是什么?”

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A model provides a theoretical probability, which is the expected likelihood of an outcome based on the underlying rules. An experiment provides an observed proportion, which is calculated from the actual outcomes recorded.

Conditions: The context is a short run of experiments.; Comparing theoretical probability from a model with observed proportion from data.

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The denominator P(B)P(B) is the marginal probability of the evidence. It acts as a normalizing constant that ensures the posterior probability P(A∣B)P(A \mid B) is a valid probability (i.e., between 0 and 1).

Conditions: P(B)>0P(B) > 0.; The events A and B are defined on the same sample space.