Explore BrainMass

Explore BrainMass

    Expectation and Variance of a Random Variable X

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    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.

    © BrainMass Inc. brainmass.com June 3, 2020, 8:58 pm ad1c9bdddf
    https://brainmass.com/statistics/dispersion-and-spread-of-data/expectation-variance-random-variable-x-160618

    Solution Summary

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

    $2.19

    ADVERTISEMENT