CREATE TABLE table_name_98 (land_area__km²_ INTEGER, country VARCHAR(255), population_density__pop_per_km²_ VARCHAR(255))
What is the land area of Switzerland with a population density fewer than 188 km²?
    
SQL: SELECT AVG(land_area__km²_) FROM table_name_98 WHERE country = "switzerland" AND population_density__pop_per_km²_ < 188