user: Question: How many points did Connaught Type A chassis earn on average before 1955?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1953.0, 'HW Motors', 'HWM 53', 'Alta', 0.0]
SQL:

assistant: SELECT AVG("Points") FROM "Table" WHERE "Year" < 1955.0 AND "Chassis" = 'Connaught Type A';