I played golf today at the club in the neighbouring town where I am not a member. I played with 3 guys I have never met before but they were friends. We got to the 7th tee and one of them asked which footy team I followed. I responded sheepishly with North Melbourne expecting the normal sighs of sympathy in response. To my surprise he got very excited informing me he was a North supporter as were the other 2 members of the group. So all 4 members of the group were North supporters. What are the chances of that?
btw - none of them thought recruiting Jack Darling was a good idea.
Hard to calculate exactly. As they are all friends, they may have bonded at some point over their support of the same club. I'd say a group of friends supporting the same club has a higher chance than 3 random strangers. Let's say twice as likely here and double the odds of the general population.
In Vic, there's 10 teams, they would likely account for around 90% of supporters. North had 6.3% of the Vic memberships. Let's round that to 5.7% of people supporting North in Vic.
Your support is known, so it's just the odds of the other 3 all being North supporters. 5.7% x 5.7% x 5.7% is around 0.02%, doubling that makes it 0.04%, or around 1 in 2500 chance.
Possibly well off the mark, but that's my best guess.