On average, when were vineyard schools founded?
CREATE TABLE table_name_13 (founded INTEGER, suburb_town VARCHAR)
SELECT AVG(founded) FROM table_name_13 WHERE suburb_town = "vineyard"
### Context: CREATE TABLE table_name_13 (founded INTEGER, suburb_town VARCHAR) ### Question: On average, when were vineyard schools founded? ### Answer: SELECT AVG(founded) FROM table_name_13 WHERE suburb_town = "vineyard"