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Re: st: probability question


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: probability question
Date   Wed, 28 Oct 2009 09:10:39 -0400

blue (he says it is the only hat he owns) :-)

Fred Wolfe wrote:
> 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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