user: Question: What's the average attendance of the league with a total attendance of 2268508?
Columns: ['League', 'Sport', 'Season', 'Total attendance', 'Average attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['National Hockey League', 'Ice hockey', '2012–13', '12758849', 17721.0]
SQL:

assistant: SELECT "Average attendance" FROM "Table" WHERE "Total attendance" = '2268508';