You can't really average it, because the size depends on the purpose and type. Such as coliseum, football, Baseball, etc...
In my opinion, all stadiums should be 625ft in diameter. Why? Because Miles, feet, and inches all come from ancient Roman measurements. One of them would be a "furlong", which in Latin is "stadium", and measures exactly 625ft.
Just a thought.
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The smallest is the Colts' RCA dome at 60,272.
largest is the Redskins' FedEx Field at 80,000
But they average about 70,000