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 second method is to test if the conditional probability of A given B is equal to the probability of A. Again for simplicity, we can use an already calculated value from above.

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 probability of red on the next spin is 18/38, the same as the conditional probability of red on the next spin given that there have been five consecutive reds.

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

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