user: Question: What are the average points with a Chassis of Zakspeed 881?
Columns: ['Year', 'Chassis', 'Engine(s)', 'Tyres', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1985.0, 'Zakspeed 841', 'Zakspeed S4 t/c', 'G', 0.0]
SQL:

assistant: SELECT AVG("Points") FROM "Table" WHERE "Chassis" = 'Zakspeed 881';