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Unformatted text preview: ords, a random variable is a function X : Ω → R,
where Ω is the sample space of the random experiment
under consideration and R represents the set of all real
numbers. Notes Random Variable
Variance 10.3 Expected Value
and Variance Expected Value
The expected value of a discrete r.v. X , denoted by E[X ]
is deﬁned by
E[X ] =
x × pX (x )
x Remark: The expected value of a discrete r.v. is a
weighted average of its possible values, and the weight
used is its probability. So...
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