What is the average year for a merzario a2 chassis?
CREATE TABLE table_name_91 (year INTEGER, chassis VARCHAR)
SELECT AVG(year) FROM table_name_91 WHERE chassis = "merzario a2"
### Context: CREATE TABLE table_name_91 (year INTEGER, chassis VARCHAR) ### Question: What is the average year for a merzario a2 chassis? ### Answer: SELECT AVG(year) FROM table_name_91 WHERE chassis = "merzario a2"