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Re: st: probability question


From   Fred Wolfe <fwolfe@arthritis-research.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: probability question
Date   Wed, 28 Oct 2009 07:50:15 -0500

What color was the hat?

On Wed, Oct 28, 2009 at 7:37 AM, Richard Goldstein
<richgold@ix.netcom.com> wrote:
> it's been a long time since I thought about questions like this, but, as
> a lead-in to a study, a client has asked the following question which he
> thinks he understands and says is related to where he wants to go:
>
> during a consecutive period of 120 days, if it rains on 7 days and my
> client wears a hat on 4 days (these are independent of any knowledge of
> the weather), what is the probability that it will rain on 3 of the days
> on which he is wearing a hat?
>
> my client swears that this is not a homework problem for him or his wife
> or one of their kids!
>
> Rich
> *
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>



-- 
Fred Wolfe
National Data Bank for Rheumatic Diseases
Wichita, Kansas
NDB Office  +1 316 263 2125 Ext 0
Research Office +1 316 686 9195
fwolfe@arthritis-research.org

*
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