Results 1 to 2 of 2

Math Help - Finding the number of trials needed to obtain an outcome that is not equal to zero

  1. #1
    Newbie
    Joined
    Nov 2009
    From
    NY, NY
    Posts
    5

    Finding the number of trials needed to obtain an outcome that is not equal to zero

    Consider independent trials each of which results in outcome i, i=1,2,...k with probability p of i. Let N denote the number of trials needed to obtain an outcome that is not equal zero and let X be that outcome. Find P(N=n) where n>=1
    Thanks so much!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,763
    Thanks
    5
    This sounds like a geometric with probability of success p=p_1+p_2+...+p_k

    P(N=n)=p(1-p)^{n-1}

    I think I had my p's and q's backwards, I misread the NOT equal to zero.
    And what's X doing here?
    Last edited by matheagle; November 22nd 2009 at 05:48 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: February 25th 2011, 09:55 PM
  2. When a limit is equal to a number...
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: September 28th 2010, 07:50 PM
  3. Replies: 1
    Last Post: May 10th 2010, 09:05 PM
  4. number of trial to obtain an outcome
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: November 15th 2009, 01:56 PM
  5. Replies: 1
    Last Post: October 13th 2008, 05:14 PM

Search Tags


/mathhelpforum @mathhelpforum