From: Barnaby Marsh
Sent: Saturday, September 30, 2017 11:33 PM
To: Jeffrey E.
Subject: Re:
ps- invention of new kinds of statistical methods from big=data a promising direction... we could talk to steve strogatz or
duncan wa=ts about this....
On Sat, Sep 30, 2017 at 7:25 PM, Barnaby Marsl >
wrote:
nonsense! possible combinations say nothing about probability<=r>
On Sat, Sep 30, 2017 at 6:23 PM, jeffrey E.=<jeevacation@gmail.com <mailto:jeevacation@gmail.com» wrote:
Combinations in the
In a two-child family, there are four and only four possible combinations o= children. We will
label boys B and girls G; in each case the first letter represents the oldest child:
{BB, BG, GB, GG}
When we know that one child is a boy, there cannot be two girls, so the sam=le space shrinks to:
{BB, BG, GB}
Two of the possibilities in this new sample space include girls:
{BG, GB}
and since there are two combinations out of three that include girls, the probability that the
second child is a girl is 2/3.
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