CREATE TABLE table_45532 ("Rank" FLOAT, "City" TEXT, "Province" TEXT, "Date of Official Foundation of Municipality" FLOAT, "2006" FLOAT, "1996" FLOAT, "1986" FLOAT, "1976" FLOAT, "1966" FLOAT, "1956" FLOAT)

What is teh average rank of the city of mashhad, which had less than 667770 in 1976?
SELECT AVG("Rank") FROM table_45532 WHERE "City" = 'mashhad' AND "1976" < '667770'
SELECT AVG("Rank") FROM "table_45532" WHERE "1976" < '667770' AND "City" = 'mashhad'