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random variable

American

noun

Statistics.

a quantity that takes any of a set of values with specified probabilities.

random variable British

noun

rv. statistics a quantity that may take any of a range of values, either continuous or discrete, which cannot be predicted with certainty but only described probabilistically

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of random variable

First recorded in 1935–40

Example Sentences

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random variable

The appropriate formula for this random variable is the second one presented above.

From Textbooks ● Nov. 29, 2017

Said another way, a discrete random variable has to be a whole, or counting, number only.

From Textbooks ● Nov. 29, 2017

The random variable X in this case includes only the number of trials that were failures and does not count the trial that was a success in finding a person who had the disease.

From Textbooks ● Nov. 29, 2017

The probability of a specific value of a continuous random variable will be zero because the area under a point is zero.

From Textbooks ● Nov. 29, 2017

The myriad factors affecting innovativeness make the historian’s task paradoxically easier, by converting societal variation in innovativeness into essentially a random variable.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023