There's 23 people on the pitch at kick-off...

[gers1978]

...two teams of 11 and a referee.

What's the chances that at least 2 people on the pitch share a birthday? (day/month only, and ignore leap years/twins/etc)

Spoiler

50.7% - it's more likely than not that at the start of any football match, at least 2 people on the pitch share a birthday.

 

[TheFantasticNinetiesFox]

Birthday caird pish

EDIT: In all seriousness that’s quite a stat

 

[Boabinho]

Pass the doobie ffs

 

[ewilliamson]

Great to know

 

[DonDraper]

...two teams of 11 and a referee.

What's the chances that at least 2 people on the pitch share a birthday? (day/month only, and ignore leap years/twins/etc)

Spoiler

50.7% - it's more likely than not that at the start of any football match, at least 2 people on the pitch share a birthday.

Keech

 

[RWB92]

All statistics, less common that you think. 365/23 = nearly 16, it doesn’t state it has to be a specific date or that would increase the odds ten fold

I’ve explained it pish, but it’s the birthday paradox

 

[Dalex3]

Fukk off

 

[PrisonMike]

Aye well happy birthday to them then

Well done for existing

 

[Broom-loneranger]

Hows that then?

 

[Commander Bjorklund]

Wonder what the % was with the people on the pitch at the legends game in March.

 

[Dynamo]

Heard that a while ago. Don’t know how it works but my answer was Evens based on hearing it before

 

[Cavin]

15.87/1

 

[DazRFC94]

Birthday problem - Wikipedia

en.wikipedia.org

For anyone who was like me and sure the OP was talking nonsense

 

[vicbex]

All statistics, less common that you think. 365/23 = nearly 16, it doesn’t state it has to be a specific date or that would increase the odds ten fold

Isnt it 365 ÷ 22 as the other birthday boy doesnt count?

 

[RWB92]

Isnt it 365 ÷ 22 as the other birthday boy doesnt count?

Spot on, there’s 365 options and atleast one has to be it, so it’s 22.
Few too many Peronis

 

[Peter_OHanrahahanrahan]

One of the great counter-intuitive facts, that one.

I also like the one about every properly shuffled pack of cards being in an order that has never existed before, or ever will again.

 

[Alfie shhh!]

I also like the one about every properly shuffled pack of cards being in an order that has never existed before, or ever will again

I'm doubting that one!

 

[vicbex]

Spot on, there’s 365 options and atleast one has to be it, so it’s 22.
Few too many Peronis

Apparently Im wrong as the answer is explained on the thread and its quite incredible.

 

[Shengus Malengus]

Lot a shite.

I share a birthday with Sebastien Faure and I've never been on the same pitch.

 

[Fitba Juice]

For 23 people the probability is 50.7%
For 30 people the probability is 70.6%
For 40 people the probability is 89.1%
For 50 people the probability is 97.0%
For 75 people the probability is 99.97%

As the number of people increases the probability gets more closer to 100%.
It is exactly 100% for 366 people.

Quite a leap from 75 to 366 to get only a 0.03% rise in probability.

 

[sheddensbear]

List all the players birthdays and prove it. Alternatively, list the birthdays of all our 1st team players.

 

[mdingwall]

 

[SSR]

Matondo was born on the 12th of July

 

[Peter_OHanrahahanrahan]

List all the players birthdays and prove it. Alternatively, list the birthdays of all our 1st team players.

https://www.bbc.co.uk/news/magazine-27835311

Someone did it with the squads at the World Cup a few years ago, which conveniently contained 23 players. Exactly half of the squads, 16 of 32, had at least one pair of shared birthdays.

 

[Colinstein69]

...two teams of 11 and a referee.

What's the chances that at least 2 people on the pitch share a birthday? (day/month only, and ignore leap years/twins/etc)

Spoiler

50.7% - it's more likely than not that at the start of any football match, at least 2 people on the pitch share a birthday.

Ah well, that’s my mind blown. Would never have guessed that to be the case.

Love facts like these, thanks OP.

 

[Shawlands_Bluenose]

I remember an old maths teacher telling us in school that there was similar levels of probability of having two people in an average class size of 25 sharing a birthday

 

[scoot4nat]

https://www.bbc.co.uk/news/magazine-27835311

Someone did it with the squads at the World Cup a few years ago, which conveniently contained 23 players. Exactly half of the squads, 16 of 32, had at least one pair of shared birthdays.

Came here to say exactly this!

 

[Positively Blue]

Ma heed hurts.

 

[Badger]

What a lot of shite.

If this is correct then I challenge you to go through our last 20 games and tell me who shared a birthday. If correct then you should get round about 10 give or take.

 

[Diego Maradona]

Bet you’re popular at a party

 

[Dr. Strangelove]

https://www.bbc.co.uk/news/magazine-27835311

Someone did it with the squads at the World Cup a few years ago, which conveniently contained 23 players. Exactly half of the squads, 16 of 32, had at least one pair of shared birthdays.

Ruud Van Nistelrooy and Patrick Kluivert were born on the exact same day.

 

[EKblue]

I was born on the same date not year as Pele on a slight less talented level it’s also the same as Christian Daily and Big Amo.

 

[RedWhiteBlueLux]

I find this kind of stuff pretty interesting. I still can’t believe that it is true even after reading what I could understand of the Wikipedia page

 

[Gazzabear v2.0]

There's 1445 users on site just now. How many do you think looked at this and thought what the actual f uck is this?

Spoiler: Spoiler

100%

 

[SE5]

Lets just swap Simply the Best for Happy Birthday just now then.

 

[JeffreySpauIding]

You ever met someone with the same birthday as you? Me either.

 

[VelvetThunder]

Lets just swap Simply the Best for Happy Birthday just now then.

I didn’t watch the real Tina Turner sing at Ibrox for this.

 

[Alfredo the great]

I was born on exact same day as our friend Roy keane.

 

[Bearskin]

Hows that then?

That would only be 15 with fielders, 2 umpires and the other team's 2 batsmen

 

[vicbex]

You ever met someone with the same birthday as you? Me either.

My grandson.

 

[thenorthseabear]

100% chance if you have twins on your team.

 

[Loud and proud]

I literally have no clue what is going on here.

 

[JMCK]

Spot on, there’s 365 options and atleast one has to be it, so it’s 22.
Few too many Peronis

Which wold compliment your paradox?

 

[JMCK]

100% chance if you have twins on your team.

Not quite though, depending on the hour of birth.

 

[Super Cooper]

statistics show that 50% of the people believe them

 

[NegrisLob]

Birthday problem - Wikipedia

en.wikipedia.org

For anyone who was like me and sure the OP was talking nonsense

Love it, good stat op

I'm using this for a medical statistics course in work next month now.

 

[hhss]

I remember an old maths teacher telling us in school that there was similar levels of probability of having two people in an average class size of 25 sharing a birthday

We were the same although there was 26 in our class. As it happens, there were 4 kids with the same birthdays (2 and 2).

Tbf, one set was twins, still…

 

[WinkieWATP]

 

[MarcoNegri]

Great stat.

Had a quick look at our squad against PSV's as an example and Yilmaz has the same birthday as the PSV reserve goalie!

 

[Bearsdenloyal]

Birthday problem - Wikipedia

en.wikipedia.org

For anyone who was like me and sure the OP was talking nonsense

. While it may seem surprising that only 23 individuals are required to reach a 50% probability of a shared birthday, this result is made more intuitive by considering that the comparisons of birthdays will be made between every possible pair of individuals. With 23 individuals, there are (23 × 22) / 2 = 253 pairs to consider, much more than half the number of days in a year