Today is my birthday, and in fact it is also the birthday of at least one other Maplesoft employee (not surprising since more than 23 people work here - considering the generalized birthday problem, I even know of 3 people here who share the same birthday). Of course, it turns out that birthdays are not evenly distributed through out the year and so I wanted to know if someone with an August birthday is more likely to share than someone with an April birthday.
I found found a large set of birth data from an insurance company on http://www.panix.com/~murphy/bday.html and I used Maple to create the following plot:
Looking at the centered moving average, it looks like, indeed, us August birthdays should expect to share with more people than others.
For other who want to play with the data: here is the worksheet used to compute this graph birthday-distributio.mw.