CREATE TABLE table_61767 ("School" TEXT, "Suburb/Town" TEXT, "Years" TEXT, "Founded" FLOAT, "Website" TEXT)

On average, when were vineyard schools founded?
SELECT AVG("Founded") FROM table_61767 WHERE "Suburb/Town" = 'vineyard'
SELECT AVG("Founded") FROM "table_61767" WHERE "Suburb/Town" = 'vineyard'