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Forum index » Science and Technology » Math » Probability
Need a formula
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Eric Plante
science forum beginner


Joined: 13 Jun 2006
Posts: 2

PostPosted: Tue Jun 13, 2006 2:08 am    Post subject: Need a formula Reply with 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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Janusz Kawczak
science forum beginner


Joined: 18 Feb 2006
Posts: 10

PostPosted: Tue Jun 13, 2006 4:50 am    Post subject: Re: Need a formula Reply with quote

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

PostPosted: Tue Jun 13, 2006 9:51 am    Post subject: Re: Need a formula Reply with quote

"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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