What is the average number of bronze medals won by Poland?
CREATE TABLE table_63487 (
    "Rank" real,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
)
SELECT AVG("Bronze") FROM table_63487 WHERE "Nation" = 'poland'
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 number of bronze medals won by Poland? ### Input: CREATE TABLE table_63487 (
    "Rank" real,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
) ### Response: SELECT AVG("Bronze") FROM table_63487 WHERE "Nation" = 'poland'