CREATE TABLE table_46928 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

What is the round for the ufc on fox: velasquez vs. dos santos event?
SELECT AVG("Round") FROM table_46928 WHERE "Event" = 'ufc on fox: velasquez vs. dos santos'
SELECT AVG("Round") FROM "table_46928" WHERE "Event" = 'ufc on fox: velasquez vs. dos santos'