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May 30th, 2011, 03:46 AM  #1 
Newbie Joined: Apr 2011 Posts: 8 Thanks: 0  probability function
Hello, I've got the next question:If there are 3 balls and I put them in boxes in a random way,indepedenttly every one, considering the aleatory variable X= number balls on first box, which is the table of probability function X?? Thanks anyway

May 30th, 2011, 12:26 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733  Re: probability function
The distribution is binomial, with p = prob. that ball is in first box (assume same for all balls), and n = 3. (q=1p). (Pk = prob(X=k)). P0 = q^3 P1 = 3pq^2 P2 = 3p^2q P3 = p^3 You will have to specify p, which could depend on the number of boxes. 

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