Defined: Random. Variable. It is a NOUN. (Merium-Webster Online.)
Do I have to use it in a sentence? Statistics is not my strong suit. Time for some research.
Try this forum entry by Subhotosh Khan on freemathhelp.com: “z(x,y) = x2 + y2 – 1 is a bi-variate polynomial function. For each unique input (x & y), the function returns a unique output (z).”
Yikes. Turns out to be an appropriate word to publish for back-to-school. But I didn’t just pick this term at random (random, get it?), I heard it used. In a similar context, by the way. Where? The Big Bang Theory. It’s a fun show and in almost every episode you can pick up at least one good word to add to your active vocabulary. Something one would expect from a bunch of science nerds! But if you really want to learn the nuance of this word, you can learn all about math at Khan Academy. (Would serendipitous describe finding two sources by the same last name?)
But how do I use it, you ask? Substitute it for any noun (person, place, thing, etc.) that can be substituted. It would be used in a generalized manner unless you are speaking math lingo. You will have to find context in your own work or life for this one.
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A random variable with a numerical value that is defined on a given sample space.
[From Latin varitus, past participle of varire, to vary; see vary.] (The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.)
1. (Mathematics & Measurements / Statistics) Statistics a random variable or a numerical value taken by it
2. a less common word for variant (Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003)
a quantity having a numerical value for each member of a group, especially one whose values occur according to a frequency distribution.
Origin: late 19th century: from Latin variatus ‘diversified’, past participle of variare ( Oxford Dictionaries. Oxford University Press, n.d. Web. 01 September 2013)