user: Question: Tell me the average attendance for week of 11
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 5, 1981', 'at Tampa Bay Buccaneers', 'L 21-13', 66287.0]
SQL:

assistant: SELECT AVG("Attendance") FROM "Table" WHERE "Week" = 11.0;