I saw this post a few days ago and made a mental note to find it and come back to it. I thought “Don’t a whole lot of people have a ‘2′ somewhere in their birthday? This seems like reblog bait”
I told my friend about this and he calculated the rough probability of having a “2″ somewhere in your birthday. If we’re only talking about the Month/Day format, then 179/365 or 180/366(on leap years) dates during the year will have a “2″ in them. You can see how the total is arrived at below.
The number of dates (in month/day format) by month that will contain the number “2″ in them:
February – 28 on regular year, 29 on leap year
So about 49% of the dates in the year will have a “2″ in them.
If you’re talking about the Month/Day/Year format, then the likelihood of a “2″ appearing in the date is even higher because some years have a “2″ in them, creating another opportunity for a “2″ to appear in your birth date.
I’ll guess that the majority of Tumblr users were born between 1980 and 2002 (if you change the years, it doesn’t make much of a difference). That encompasses 8401 days with 8401 unique dates. 5053 of those dates will have the number “2″ In them.
The number of dates (in month/day/year format) by year that will contain the number 2:
1980 – 180/366 1981 – 179/365
1982 – 365/365 1983 – 179/365
1984 – 180/366 1985 – 179/365
1986 – 179/365 1987 – 179/365
1989 – 179/365 1990 – 179/365
1991 – 179/365 1992 – 366/366
1993 – 179/365 1994 – 179/365
1995 – 179/365 1996 – 180/366
1997 – 179/365 1998 – 179/365
1999 – 179/365 2000 – 366/366
2001 – 365/365 2002 – 365/365
So about 60% of dates written Month/date/year in these 23 years will have a “2″ somewhere in them.
Even if you took out the years 2000-2002, which all have a “2″ in them, 54% of the dates written Month/date/year in the 20 years between 1980-1999 will still have a “2 somewhere in them.
Any way you slice it, there’s nothing particularly special about having the number “2″ in part of your birthday and this post is just reblog bait.
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