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    Joint Destiny - Random Variable

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    Two different problems below:

    #1.) The following is the joint density for two random variables, X1 and X2:

    f(X1, X2): {3X1 for 0<=X2<=X1<=1
    0 elsewhere

    Find P(0.2<=X2<=0.4)

    Which of the following answers:

    a.) 0.3750

    b.) 0.2720

    c.) 0.1800

    d.) 0.3(1- X1)^2

    #2) Let X be a normal random variable with mean (mew) and std. dev., let
    W=(X-mew/std. dev.)^2, Then the distribution for W is :

    Which one?

    a.) N(mew^2,check mark std, dev.)

    b.) N(mew^2, std. dev.^2)

    c.) N(check mark mew, std. dev.^2)

    d.) X^2(1)

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    https://brainmass.com/statistics/quantative-analysis-of-data/joint-destiny-random-variable-33580

    Solution Preview

    pls see attached file

    Random Variables
    ________________________________________
    Two different problems below:

    #1.) The ...

    Solution Summary

    Two different problems below:

    #1.) The following is the joint density for two random variables, X1 and X2:

    f(X1, X2): {3X1 for 0<=X2<=X1<=1
    0 elsewhere

    Find P(0.2<=X2<=0.4)

    Which of the following answers:

    a.) 0.3750

    b.) 0.2720

    c.) 0.1800

    d.) 0.3(1- X1)^2

    #2) Let X be a normal random variable with mean (mew) and std. dev., let
    W=(X-mew/std. dev.)^2, Then the distribution for W is :

    Which one?

    a.) N(mew^2,check mark std, dev.)

    b.) N(mew^2, std. dev.^2)

    c.) N(check mark mew, std. dev.^2)

    d.) X^2(1)

    $2.49

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