user: Question: What is the winning pct for jersey 15?
Columns: ['Quarterback', 'Jersey No.', 'Games Started', 'Wins', 'Losses', 'Ties', 'Winning Pct.']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'text']
Sample row: ['Everett Golson', '5', 11.0, 10.0, 1.0, 0.0, '.909']
SQL:

assistant: SELECT "Winning Pct." FROM "Table" WHERE "Jersey No." = '15';