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    drfarah's Avatar
    drfarah Posts: 12, Reputation: 1
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    #1

    Nov 11, 2009, 03:49 AM
    Probability + random variables
    Please I want to know the answer of:

    a discrete random variable X has probability function
    px(x)=2ֿx (this means 2 to the power of -x), x=1,2,3,.

    Calculate:
    a) Pr(X is even)
    b)Pr(x>5)
    c)Pr(X is divisible by 3)

    Thanks a lot
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Nov 11, 2009, 05:44 AM
    Integration.

    If x is even, then it must be divisible by 2. Right?




    Try the others and let me know if you get stuck. See how to set up the third one now using this idea. How about #2?
    drfarah's Avatar
    drfarah Posts: 12, Reputation: 1
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    #3

    Nov 11, 2009, 11:49 AM

    Sorry but I didn't understand :(
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Nov 11, 2009, 12:45 PM
    Then you best see your instructor.
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