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Homework Help: Random Variable X

  1. Oct 13, 2011 #1
    The random variable X assumes the values 1,2,3 and 4 with equal probability. Find the density functions of the following variates:

    Attempted solutions:

    X 1 2 3 4
    Pr(X) 1/4 1/4 1/4 1/4

    a) Y=1-2X

    Y -1 -3 -5 -7
    Pr(Y) 1/4 1/4 1/4 1/4

    b) Z= X/(X+1)

    Z 1/2 2/3 3/4 4/5
    Pr(Z) 1/4 1/4 1/4 1/4

    Are my solutions for parts a and b correct?
     
  2. jcsd
  3. Oct 13, 2011 #2
    Yes, this is correct.
     
  4. Oct 13, 2011 #3
    Thank you. How'd your exam go today? I'm ready to get my exam over tomorrow I have a few more next week that I'm also studying for. Ahh the life of a college student. lol.
     
  5. Oct 14, 2011 #4
    It went fine except for one problem that made absolutely no sense to me. Don't forget to study the pdf of a random variable of a decreasing function, not just an increasing one. There was no extra credit :( But I guess thats what you get when you can do six and he'll grade your best five.
     
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