user: Question: What is the average number of points for a team in the 250cc class with fewer than 0 wins?
Columns: ['Year', 'Class', 'Team', 'Points', 'Rank', 'Wins']
Types: ['real', 'text', 'text', 'real', 'text', 'real']
Sample row: [1980.0, '250cc', 'Yamaha', 26.0, '8th', 0.0]
SQL:

assistant: SELECT AVG("Points") FROM "Table" WHERE "Class" = '250cc' AND "Wins" < 0.0;