CREATE TABLE table_68051 ("Name" TEXT, "Years" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

What is the average decile of Ruapehu college, which has a state authority?
SELECT AVG("Decile") FROM table_68051 WHERE "Authority" = 'state' AND "Name" = 'ruapehu college'
SELECT AVG("Decile") FROM "table_68051" WHERE "Authority" = 'state' AND "Name" = 'ruapehu college'