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

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

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

Either C would be pardoned or himself, so by all the laws of conditional probability, his chances of survival had gone up from 1/3 to 1/2.

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