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    Expectation and variance of a random variable

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    Let be a random variable with the following probability distribution:
    Value Value
    x of X P(X=x)
    4 0.30
    5 0.05
    6 0.20
    7 0.30
    8 0.10
    9 0.05
    Find the expectation E(X) and variance of VAR(X) of X

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    Expectation and variance of a random variable
    Let be a random ...

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    The expert examines expectation and variances for sample solutions.