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    Mean and variance of discrete random variable

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    1. Suppose that a variable x has the following distribution function:
    x p(x)
    3 0.23
    5 0.41
    9 0.36
    What is the population mean?

    2. Suppose that a variable x has the following distribution function:
    x p(x)
    1 0.18
    6 0.16
    9 0.15
    24 0.51
    What is F(9)?

    3. Suppose that a variable x has the following distribution function:
    x p(x)
    1 0.19
    5 0.15
    8 0.66
    What is the population variance?

    4. Suppose that a variable x has the following distribution function: x p(x) 3 0.23 5 0.41 9 0.36 What is the expected value of (X - mean of x)^2?

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    https://brainmass.com/statistics/dispersion-and-spread-of-data/mean-variance-discrete-random-variable-112076

    Solution Summary

    Calculation of mean and variance of a discrete random variable.

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