conditional probability

American  

noun

1. Statistics, Mathematics. the probability that an event will occur under the condition that another event occurs first: equal to the probability that both will occur divided by the probability that the first will occur.

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conditional probability British  

noun

1. statistics the probability of one event, A, occurring given that another, B, is already known to have occurred: written P ( A|B ) and equal to P ( A and B )| P ( B )

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Etymology

Origin of conditional probability

First recorded in 1960–65

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Example Sentences

See Examples For:

conditional probability

Because this is a conditional probability, we restrict the sample space to consider only those outcomes that have a blue marble in the first draw.

From Textbooks ● Mar. 27, 2020

The probability of picking the three of diamonds is called a conditional probability because it is conditioned on what was picked first.

From Textbooks ● Nov. 29, 2017

Independent events are defined as a situation where the conditional probability is simply the probability of the event of interest.

From Textbooks ● Nov. 29, 2017

The reader analyzed the problem using conditional probability, which enables you to answer questions of the type "what are the odds of event A happening given that event B has happened?"

From Scientific American ● Apr. 15, 2011

Many mundane mistakes in reasoning can be traced to a shaky grasp of the notion of conditional probability.

From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos

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