SELECT AVG(land_area__km²_) FROM table_name_98 WHERE country = "switzerland" AND population_density__pop_per_km²_ < 188
Berapa luas tanah Swiss dengan kepadatan populasi kurang dari 188 km²?
CREATE TABLE table_name_98 (land_area__km²_ INTEGER, country VARCHAR, population_density__pop_per_km²_ VARCHAR)