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    The Expectation and Variance of a Random Variable

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    Let X be a random variable with the following probability distribution:

    Value x of X P(X=x)
    -10 0.05
    0 0.30
    10 0.40
    20 0.10
    30 0.15

    Find the expectation E(X) and variance VAR(X) of X.

    E(x)=
    Var(X)=

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    https://brainmass.com/statistics/variance/expectation-variance-random-variable-268000

    Solution Summary

    This solution examines the expectation and variance of a random variable.

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