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Random variables (probability)

  1. Oct 30, 2015 #1
    1. The problem statement, all variables and given/known data
    I have the joint cdf of two random variables X and Y and they ask me to find the cdf of just Y. I know that you just take the limit of the cdf as x->infinity, but I am just wondering if you can also do this by calculating the joint pdf and then the marginal of Y and then from the marginal of Y, the cdf of Y.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 30, 2015 #2

    Ray Vickson

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    Science Advisor
    Homework Helper

    Yes, sometimes that is how it must be done. However, in your case that would be doing it the hard way, since taking the ##x \to \infty## limit is easier.
  4. Oct 30, 2015 #3
    Thank you!!!!, I was so worried about that one in the test.
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