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

Example Sentences

In order to solve Example 3.30 we had to draw upon the concept of conditional probability from the previous section.

From Textbooks • Nov. 29, 2017

In short, conditional probability is the chance that something will happen given that some other event has already happened.

From Textbooks • Nov. 29, 2017

Write your answer as a conditional probability statement.

From Textbooks • Sep. 19, 2013

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

The conditional probability of getting a 12 when you know you have gotten at least an 11 is Vs.

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