----- Original Message -----
From: "Frank van Lindert" <l>
To: "Olympus Camera Discussion" <t>
Sent: Thursday, February 12, 2009 10:26 AM
Subject: Re: [OM] Lincoln's Bicentennial Anniversary
>
> On Thu, 12 Feb 2009 09:27:57 -0400, John Hudson wrote:
>
>>I recall from high school statistics that in a randomly selected group of
>>25
>>to 30 people there is a better than 50% chance that at least two people
>>will
>>have the same birthday [day and month].
>>
> True, but the chance that at least two would share a fixed date for
> their birthday, e.g. 12 Februay, is _much_ smaller! 1/365th of your
> 50%, I would guess.
I don't think I implied those two people would share a specific birthday,
only that they would share a common birthday date.
>
> With two dice the chance that you throw two threes is much smaller
> than the chance that you throw two equal numbers. 1/6th.
You might like to pick up a copy of "The Drunkard's Walk, How Randomness
Rules Our Live" by Leonard Mlodinow / published by Pantheon [2008]; ISBN
978-0-375-42404-5
>
>>On that basis, there should be several people on this list who are sharing
>>birthdays today with Abe Lincoln and Charles Darwin.
>>
> Perhaps, but not 'on that basis'. For each of us the chance of having
> this birthday is 1/365th....To find two such people you would need
> several hundred list members, IMHO.
>
>>
>>We should take a poll .................. don't be shy out there !
>>
>>jh
>
> Frank van Lindert, to lazy to do the exact arithmetics...
>
> Utrecht NL.
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