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Eric Plante science forum beginner
Joined: 13 Jun 2006
Posts: 2

Posted: Tue Jun 13, 2006 2:08 am Post subject:
Need a formula



Hi,
I need a formula to resolve the following problem:
Let say that I have a deck with X(20) cards of type A and Y(40) cards of
type B.
I'd like to know the formula to find the probability to draw V(5) cards of
type A after drawing W(12) cards.
Thanks 

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Janusz Kawczak science forum beginner
Joined: 18 Feb 2006
Posts: 10

Posted: Tue Jun 13, 2006 4:50 am Post subject:
Re: Need a formula



AFAIK, this group is not meant to provide answers to your homework
questions!
Eric Plante wrote:
Quote:  Hi,
I need a formula to resolve the following problem:
Let say that I have a deck with X(20) cards of type A and Y(40) cards of
type B.
I'd like to know the formula to find the probability to draw V(5) cards of
type A after drawing W(12) cards.
Thanks



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Pavel314 science forum addict
Joined: 29 Apr 2005
Posts: 78

Posted: Tue Jun 13, 2006 9:51 am Post subject:
Re: Need a formula



"Eric Plante" <plantee@videotron.ca> wrote in message
news:28pjg.16993$U84.393890@wagner.videotron.net...
Quote:  Hi,
I need a formula to resolve the following problem:
Let say that I have a deck with X(20) cards of type A and Y(40) cards of
type B.
I'd like to know the formula to find the probability to draw V(5) cards of
type A after drawing W(12) cards.
Thanks

You're taking a sample of 12 cards from a deck of 60 and you want to know
the probability of getting exactly 5 cards of type A, of which there are 20
in the deck. Sounds like you need the hypergeometric distribution; se the
"Defects Problem" thread recently published in this newsgroup.
Paul 

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