CREATE TABLE table_name_72 (frequency_mhz NUMBER, city_of_license VARCHAR2)

What is the average Frequency MHz that is on farwell, texas?
SELECT AVG(frequency_mhz) FROM table_name_72 WHERE city_of_license = "farwell, texas"
SELECT AVG("frequency_mhz") FROM "table_name_72" WHERE "city_of_license" = "farwell, texas"