What is the Places amount of the United States Ranking 8?
CREATE TABLE table_name_71 (
    places INTEGER,
    nation VARCHAR,
    rank VARCHAR
)
SELECT AVG(places) FROM table_name_71 WHERE nation = "united states" AND rank = 8
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 Places amount of the United States Ranking 8? ### Input: CREATE TABLE table_name_71 (
    places INTEGER,
    nation VARCHAR,
    rank VARCHAR
) ### Response: SELECT AVG(places) FROM table_name_71 WHERE nation = "united states" AND rank = 8