CREATE TABLE table_40242 ("Call sign" TEXT, "Frequency MHz" TEXT, "City of license" TEXT, "ERP W" FLOAT, "FCC info" TEXT)

Call sign k216fo has what average ERP W?
SELECT AVG("ERP W") FROM table_40242 WHERE "Call sign" = 'k216fo'
SELECT AVG("ERP W") FROM "table_40242" WHERE "Call sign" = 'k216fo'