Date: Wed, 28 Apr 1999 21:22:03 +0000
From: Marc Afifi <mafifi@redshift.com>
To: Pinhole Listserv <pinhole@exploratorium.edu>
Subject: Re: pinhole probability
Please ignore all biology.
Paul,
That is absolutely weird. Are you saying that if you meet a boy who has
one sibling, the probablity that his sibling is a girl is 2/3 **AND** if
you meet a girl the probability that her sibling is a boy is also 2/3?
This is a different question than asking what is the probability an only
child girl whose mother is pregnant will have a brother or sister, isn't
it? English schminglish.
-Marc