Two Birthdays

Wow, it's July already. Seems like just yesterday it was June.

Happy Birthdays, Eleonora and Marri. May today be good and tomorrow be better.

Forums: 
NorthwoodsMan's picture

Embodiment

... and only a month ago it seemed like it was just starting...

Happy Birthday Marri and Eleonora! Shots for Eleonora and soda for Marri!! :beer: Dance 4 :beer:

Gudy's picture

Embodiment

... you two!

Raigne's picture

Embodiment

My brain's totally in birthday mode right now, and will be for the next 20 days. Hope you guys have a great day!

Also... :crown: :crown: Burger King birthday crowns! (I'm shocked I haven't noticed that smiley before...)

TheBoy's picture

Embodiment

one for each of you. Party :beer: Party :beer:

MeiLin's picture

Most High

I hope you have awesome days! Party

Marri's picture

Supplicant

Someone want to pop over to Thailand and drag my boy back so he can spend it with me? Biggrin

Eleonora's picture

Devotee

Thanks! And happy birthday to you Marri!

Clare-Dragonfly's picture

Supplicant

What is it with this community, so many shared birthdays?!

MeiLin's picture

Most High

From Wikipedia:

In probability theory, the birthday problem, or birthday paradox[1] pertains to the probability that in a set of randomly chosen people some pair of them will have the same birthday. In a group of at least 23 randomly chosen people, there is more than 50% probability that some pair of them will both have been born on the same day. For 57 or more people, the probability is more than 99%, and it reaches 100% when the number of people reaches 366 (by the pigeon hole principle, ignoring leap years).

applejax's picture

Supplicant

can be applied to pretty much anything; if there are thirteen people in a room, two of them will be born in the same month, or so I remember from class two years ago.

V's picture

Embodiment

With thirteen people you have a 100% chance of overlap because you simply ran out of months. With 367 people you have a 100% chance of overlap since you ran out of days, including a leap year. The surprising fact is that you only need 23 people for the odds to be better than 50/50. I suspect that for months, the number is probably more like 3-4 people for that 50/50 chance.

TheBoy's picture

Embodiment

Assuming equal distribution over months:
1 person: 0% chance
2 persons: 8.3%
3 persons: 23.6%
4 persons: 42.7%
5 persons: 61.8%

V's picture

Embodiment

I ran a few quick calcs but didn't feel like checking them thoroughly enough to post them confidently. However, you got the same results. If we're wrong, at least we're wrong in poor company.

Amy's picture

Supplicant

Sorry it's late. I've been very ill of late.

May you both have a great year.

Shade's picture

Supplicant

I hope it was a delightful day! Biggrin Lots of partying and delightful presents for everyone!

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