user: ### NOW ANSWER:
Question: Which Wins have a Year of 1963, and a Class of 50cc?
Columns: ['Year', 'Class', 'Team', 'Points', 'Wins']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1961.0, '125cc', 'Suzuki', 0.0, 0.0]
SQL:

assistant: SELECT AVG("Wins") FROM "Table" WHERE "Year" = 1963.0 AND "Class" = '50cc';