Random variables are variables that have a probability distribution attached to them that determines the values each one can have. We view the random variable as a function, X: Ω → Ωx, where 
. The range of the X function is denoted by 
.
A discrete random variable is a random variable that can take on finite or countably infinite values.
Suppose we have S ∈ Ωx:
This is the probability that S is the set containing the result. ...
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