user: Question: What is the average Week when the result was w 28–20, and there were more than 46888 in attendance?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 21, 1975', 'Pittsburgh Steelers', 'L 37–0', 35853.0]
SQL:

assistant: SELECT AVG("Week") FROM "Table" WHERE "Result" = 'w 28–20' AND "Attendance" > 46888.0;