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July 25th, 2017, 10:25 AM  #1 
Member Joined: Jan 2017 From: California Posts: 80 Thanks: 8  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? 
July 25th, 2017, 12:58 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,759 Thanks: 696  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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