Birthday stats

<< < (3/4) > >>

bluegray (August 12, 2009, 11:18:27 AM):
I share my birthday with Isaac Newton - if you use the right calendar that is ::)

I have noticed that a lot of people at work have birthdays in September, 9 months away from the December holidays.
I know a lot of people with birthdays in October - probably for the same reason ;)

BTW. You can now do this: http://forum.skeptic.za.org/tests/latex/
Mefiante (August 12, 2009, 20:06:14 PM):
Stop press: 'Luthon don't bother. … I couldn't help noticing what seemed like a huge unlikelyhood.
Ooops, only caught this tonight. Still, it made for an interesting and revealing exercise.



BTW. You can now do this: …
Thanks! We gots LaTeX! Now we confuzzles the bejabbers out of everyone. ;D

'Luthon64
Rigil Kent (August 12, 2009, 21:42:59 PM):
Quote
Still, it made for an interesting and revealing exercise.

For sure - I certainly learned a few things about intuitive and real probabilities! Thanks for crunching the numbers for us.

ETA: Just one thing though, shouldn't the probabilities in the table add up to 100?


Mintaka

Mefiante (August 13, 2009, 16:19:13 PM):
ETA: Just one thing though, shouldn't the probabilities in the table add up to 100?
No, because, for example, the probability of exactly two same-day birthdays does not exclude another pair or triple or quadruple, etc., of birthdays occurring on a different day in the same group of 96. All that is asked for is what the probability is that at least one pair or triple or quadruple, etc., of same-day birthdays occurs in a group, irrespective of any other same-day birthday occurrences in that group. Thus, a given group may fall into more than one of the categories given in the table, and hence the probabilities add up to more than 100%. This effect increases as the group size increases because the number of possible overlaps increases exponentially with group size.

(It should be noted that the last value of “7” in the first column of the table should actually be read as “7 or more” — something I neglected to point out at the time of posting.)

'Luthon64
Tweefo (August 14, 2009, 15:46:54 PM):
Now tell me what combination of numbers stand the best chance for Saturday's lotto

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