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    Expectation and Variance of a Random Variable X

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    Expectation and variance of a random variable
    Let X be a random variable with the following probability distribution:

    Value x of x P(X=x)
    -30 0.35
    -20 0.25
    -10 0.05
    0 0.30
    10 0.05

    Find the expectation E(X) and variance Var(x) of X.

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    Solution Summary

    The solution is comprised of step-by-step explanations of finding the expectation and variance of a random discrete variable.