On average, how many Friday the 13th's are there in a year?
Just curious. I was looking at a calendar recently, I'm not too sure what year it was, (could have been last year's) and I noticed that there were two (2) Friday the 13ths in two different months. Since yesterday was Friday the 13th, I was wondering has there been a year with NO Friday the 13th? Or is that statistically impossible? (I'm currently too lazy to pull the wall calendar for the 2012 to check how many Friday the 13ths there have been for the year 2012)