Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_37 (silver INTEGER, rank INTEGER)
### Question:
How many Silver medals did the Nation with a Rank of less than 1 receive?
### Answer:
SELECT AVG(silver) FROM table_name_37 WHERE rank < 1