What average rank that has a silver less than 0?
CREATE TABLE table_41446 (
    "Rank" real,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
)
SELECT AVG("Rank") FROM table_41446 WHERE "Silver" < '0'
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 average rank that has a silver less than 0? ### Input: CREATE TABLE table_41446 (
    "Rank" real,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
) ### Response: SELECT AVG("Rank") FROM table_41446 WHERE "Silver" < '0'