What is the average grid for jo siffert?
CREATE TABLE table_name_57 (grid INTEGER, driver VARCHAR)
SELECT AVG(grid) FROM table_name_57 WHERE driver = "jo siffert"
### Context: CREATE TABLE table_name_57 (grid INTEGER, driver VARCHAR) ### Question: What is the average grid for jo siffert? ### Answer: SELECT AVG(grid) FROM table_name_57 WHERE driver = "jo siffert"