birthday paradox
February 27, 2007 at 6:33 pm | In Uncategorized | 1 CommentThe birthday paradox states that given a group of 23 (or more) randomly chosen people, the probability is more than 50% that at least two of them will have the same birthday. For 60 or more people, the probability is greater than 99%, although it cannot actually be 100% unless there are at least 366 people.
| Group of |
Probability |
|---|---|
| 10 | 12% |
| 20 | 41% |
| 30 | 70% |
| 50 | 97% |
| 100 | 99.99996% |
| 200 | 99.9999999999999999999999999998% |
| 300 | (1 − 7×10−73) × 100% |
| 350 | (1 − 3×10−131) × 100% |
| 366 | 100% |
Taken from: Birthday Paradox @ Wikipedia
That’s pretty cool. It sounded a bit strange. But in our block, which is about 28 people we have two people with the same birthday: Yas and Atet, which I think is pretty cool (oh I said that already)
So maybe it works out. But the explanation goes on to say that it doesn’t account for certain days where birthdays are more common to occur, and for certain days where they are less likely to occur (like Feb 29 for example). It treats all days equally.
What was that for? Absoutely nothing. Just something to treat your mind to. Some boring, perfectly useless fact that you would not be much better off knowing. R-right.
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