Monthly Archives: March 2012

Statistics and Birthdays

If you have 4 people in your family there is a 70% chance that 2  people will have a birthday in the same month.  I have a family of four(only counting parents, myself, and older brother) and my birthday is in September, which is the same month as my father’s!

If you have 7 people in your family then it is likely that 2 people will have a birthday in the same week.

If you are in a group of 14 there is a 50% chance that 2 people in that group will have the same birthday.

If you are in a group of 35 there is a 85% chance that 2 people in that group will have the same birthday.

If you are in a group of 60 there is more than 99% chance that 2 people in that group will have the same birthday.

Isn’t that amazing?