People who join Mensa are in the 95-105 range.
Just like how if someone opened something called "the big dick club", 3/4ths the people in it would have 4 inch dicks.
Hmm... I see how that could work for e.g. facebook groups where anyone can join.
However, Mensa has minimum IQ requirement for membership, and I think it's above 105.
Can you elaborate how can most members have less than minimum required IQ?