Birthdays

Birthdays, Earthday, and Probability

I turned 32 a few days ago on April 22 (Earth Day), and like many people I sometimes wonder about who shares a birthday with me and what are the chances of meeting someone born on the same day as me.

There are several ways to answer this question, and I’ll consider two. The first is simple but involves making an estimate based on assumptions and no real data. (more…)