CREATE TABLE table_68264 ("Name" TEXT, "Years" TEXT, "Gender" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

tell me the average roll for pirinoa school.
SELECT AVG("Roll") FROM table_68264 WHERE "Name" = 'pirinoa school'
SELECT AVG("Roll") FROM "table_68264" WHERE "Name" = 'pirinoa school'