SCHEMA:
CREATE TABLE table_name_42 (level INTEGER, example_name VARCHAR, number_of_hus__approximate_ VARCHAR)
USER:
What is the mean level number when the example name is lower snake and the approximate number is hus is less than 370?

QUERY:
SELECT AVG(level) FROM table_name_42 WHERE example_name = "lower snake" AND number_of_hus__approximate_ < 370