what is the number of sites when the number of screens is 687 and rank is more than 7?
CREATE TABLE table_70060 (
    "Rank" real,
    "Circuit" text,
    "Headquarters" text,
    "Screens" real,
    "Sites" real
)
SELECT AVG("Sites") FROM table_70060 WHERE "Screens" = '687' AND "Rank" > '7'
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 number of sites when the number of screens is 687 and rank is more than 7? ### Input: CREATE TABLE table_70060 (
    "Rank" real,
    "Circuit" text,
    "Headquarters" text,
    "Screens" real,
    "Sites" real
) ### Response: SELECT AVG("Sites") FROM table_70060 WHERE "Screens" = '687' AND "Rank" > '7'