Birthdays

My friend recently met a girl who shares a birthday with him.  He is not the romantic type, but he was definitely moved by this remarkable coincidence.

Assuming all birthdays are evenly distributed (are they?), and ignoring freaks born on February 29th, the probability that a person you meet will have the same birthday as you is 1/365, which is approximately .27%.

This is about twice as likely as getting dealt a full house in a five-card poker hand, which hardly qualifies as “fated”.  If she had his initials, too, that would be another story.

Penalty Kicks

penalty kickThis article in the New York Times discusses some interesting facts about penalty kick success rates in soccer:

It’s not that shocking that penalty kick success rates drop on successive kicks–as in a shootout.  However, it is quite interesting that penalty kicks are far more successful when success means an immediate win than when failure means an immediate loss.

Definitely some interesting psychological analysis to be done here.

Numbers in the News Quiz — World Cup

soccer playerThrough Math for America I have been contributing to the New York Times Learning Network.  Here is a World Cup-themed math quiz I put together with a colleague, Gary Rubinstein:

http://learning.blogs.nytimes.com/2010/06/16/numbers-in-the-news-world-cup/

In addition, I also suggested some ideas for World Cup-themed math instruction:

http://learning.blogs.nytimes.com/2010/06/14/the-beautiful-game-teaching-and-learning-with-the-world-cup/

Check out my other contributions here.

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