user: Question: What is the average attendance at a week 4 game?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Venue', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 13, 1964', 'Chicago Bears', 'W 23–12', 'City Stadium', 42327.0]
SQL:

assistant: SELECT AVG("Attendance") FROM "Table" WHERE "Week" = 4.0;