Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### 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"