Qual é a população média quando as mortes são 3 557 e a data bruta da morte é inferior a 11,9?
CREATE TABLE table_name_40 (average_population__x_1000_ INTEGER, deaths VARCHAR, crude_death_rate__per_1000_ VARCHAR)
SELECT AVG(average_population__x_1000_) FROM table_name_40 WHERE deaths = "3 557" AND crude_death_rate__per_1000_ < 11.9