1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Continuous prob. distribution

  1. Dec 19, 2003 #1
    i really dont know how to ue the Latex. it doesnt work although i try it for many times.

    so, im new to this chapter. maybe this question is easy to be solved, but i cant get it.

    a continuous random variable X has cumulative distribution as attached.
    the question is what is the value of alpha.
    i try doing like this but it doesnt give any answer though.

    F(-1) = 0 = (alpha)(-1)+(alpha)

    what is the working so that i can get the answer.

    Attached Files:

    Last edited: Dec 19, 2003
  2. jcsd
  3. Dec 19, 2003 #2

    ok, if f(x) is a probability distribution I guess what matters the most is that:
    [tex]\int_D f(x)dx = 1[/tex]
    where D is the interval where f is defined (you didn't mentioned it in your question....)
  4. Dec 19, 2003 #3
    but that is a cumulative distribution.
    i copy the whole thing from the question.

    do i need to change it to probability density function first, then continue to work on it.
  5. Dec 19, 2003 #4
    then alpha is 1/3 because as I remember [itex]f(\infty) = 1[/itex]
    and also the function is continuous....
  6. Dec 19, 2003 #5
    ok. thank you
    Last edited: Dec 19, 2003
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Continuous prob. distribution