user: Question: On April 28, what was the average number of people attending?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Decision', 'Attendance', 'Series']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['April 24', 'Philadelphia', '3 – 4', 'Montreal', 'Biron', 21273.0, 'Canadiens lead 1–0']
SQL:

assistant: SELECT AVG("Attendance") FROM "Table" WHERE "Date" = 'April 28';