CREATE TABLE table_name_42 (level INTEGER, example_name VARCHAR(255), number_of_hus__approximate_ VARCHAR(255))
What is the mean level number when the example name is lower snake and the approximate number is hus is less than 370?
    
SQL: SELECT AVG(level) FROM table_name_42 WHERE example_name = "lower snake" AND number_of_hus__approximate_ < 370