CREATE TABLE table_47779 ("Rank" FLOAT, "Company" CLOB, "Headquarters" CLOB, "Industry" CLOB, "Sales  ( billion $ ) " FLOAT, "Profits  ( billion $ ) " FLOAT, "Assets  ( billion $ ) " FLOAT, "Market Value  ( billion $ ) " FLOAT)

What is the average rank for USA when the market value is 407.2 billion?
SELECT AVG("Rank") FROM table_47779 WHERE "Headquarters" = 'usa' AND "Market Value (billion $)" > '407.2'
SELECT AVG("Rank") FROM "table_47779" WHERE "Headquarters" = 'usa' AND "Market Value (billion $)" > '407.2'