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Much appreciated! I understand the questions about set size, sampling bias, etc. - those are things I'm ignoring, given the actual circumstances behind the question. (It's not sports, but a niche subset that - for sensitivity reasons - I shant mention.) Again, this is just an exercise in...

Hi folks - I need some help with a tricky probability. Here's the situation: Let's say there are 4M internet users in Age Group A. (The total set) Of those 4M, there are 1,000 users who play a specific sport. Those 1,000 are spread evenly over 125 teams, so 8 players each. 1. What's the...