CREATE TABLE table_63487 ("Rank" FLOAT, "Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

What is the average number of bronze medals won by Poland?
SELECT AVG("Bronze") FROM table_63487 WHERE "Nation" = 'poland'
SELECT AVG("Bronze") FROM "table_63487" WHERE "Nation" = 'poland'