CREATE TABLE table_46408 ("Name" TEXT, "Latitude" TEXT, "Longitude" TEXT, "Diameter  ( km ) " FLOAT, "Year named" FLOAT)

What's the average year for the name aida-wedo dorsa with a diameter less than 450?
SELECT AVG("Year named") FROM table_46408 WHERE "Name" = 'aida-wedo dorsa' AND "Diameter (km)" < '450'
SELECT AVG("Year named") FROM "table_46408" WHERE "Diameter (km)" < '450' AND "Name" = 'aida-wedo dorsa'