user: Question: What is the average Week for the game at Three Rivers Stadium, with a Record of 3–2?
Columns: ['Week', 'Date', 'Opponent', 'Location', 'Time ( ET )', 'Result', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Sun. Sep. 5', 'San Francisco 49ers', 'Three Rivers Stadium', '1:00pm', 'L 24–13', '0–1']
SQL:

assistant: SELECT AVG("Week") FROM "Table" WHERE "Location" = 'Three Rivers Stadium' AND "Record" = '3–2';