CREATE TABLE table_name_29 (land_area__hectares_ INTEGER, density__inh_km²_ VARCHAR(255), population VARCHAR(255))
What is the average land area with a density of 815.48, and a Population larger than 411?
    
SQL: SELECT AVG(land_area__hectares_) FROM table_name_29 WHERE density__inh_km²_ = 815.48 AND population > 411