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  3. a random variable x can take on three possible val

A random variable X can take on three possible values: -5,0, or 10. Each of...

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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?

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