CREATE TABLE table_36370 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" TEXT, "Class" TEXT, "FCC info" TEXT)

What is the average Frequency MHz that is on farwell, texas?
SELECT AVG("Frequency MHz") FROM table_36370 WHERE "City of license" = 'farwell, texas'
SELECT AVG("Frequency MHz") FROM "table_36370" WHERE "City of license" = 'farwell, texas'