A random variable X can take on three possible values: -5,0, or 10. Each of these values is associated with the following

Question

A random variable X can take on three possible values: -5,0, or 10. Each of these values is associated with the following probabilities:

P(X=-5) = P(X= 0) = 0.4 and 
P(X= 10) = 0.2.

What is the variance of X?

Kunduz · Accepted Answer

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