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July 25th, 2017, 10:25 AM   #1
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Definition of a random variable

Hi guys
Definition from book: A random variable $X$ is defined to be a numerically valued function of the elementary events $Ei$

what does it mean it plain english? I understand the numerical and the random aspect but how is it a function of events?
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July 25th, 2017, 12:58 PM   #2
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https://en.wikipedia.org/wiki/Random_variable

Above gives a much more extensive discussion. It is not easy to answer your question in a short summary, particularly since the book definition is incomplete.
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