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    expected value and variance of discrete random variable

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    1)If the standard deviation is 1.71 what is the variance?

    2)Using the probability distribution listed. What is the mean?

    x 0 1 2 3

    P(x) 0.2 0.1 0.3 0.4

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    https://brainmass.com/statistics/variance/expected-value-variance-discrete-random-variable-189577

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    The solution provides detailed calculations of expected value and variance of discrete random variable.

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