What is the average rank for USA when the market value is 407.2 billion?
CREATE TABLE table_47779 (
    "Rank" real,
    "Company" text,
    "Headquarters" text,
    "Industry" text,
    "Sales (billion $)" real,
    "Profits (billion $)" real,
    "Assets (billion $)" real,
    "Market Value (billion $)" real
)
SELECT AVG("Rank") FROM table_47779 WHERE "Headquarters" = 'usa' AND "Market Value (billion $)" > '407.2'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average rank for USA when the market value is 407.2 billion? ### Input: CREATE TABLE table_47779 (
    "Rank" real,
    "Company" text,
    "Headquarters" text,
    "Industry" text,
    "Sales (billion $)" real,
    "Profits (billion $)" real,
    "Assets (billion $)" real,
    "Market Value (billion $)" real
) ### Response: SELECT AVG("Rank") FROM table_47779 WHERE "Headquarters" = 'usa' AND "Market Value (billion $)" > '407.2'