user: Question: What is the average Attendance at a game with a Result of W 30-23?
Columns: ['Date', 'Opponent', 'Location', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['09/08/1979', 'Appalachian State', 'Groves Stadium • Winston-Salem, NC', 'W 30-23', 26500.0]
SQL:

assistant: SELECT AVG("Attendance") FROM "Table" WHERE "Result" = 'W 30-23';