CREATE TABLE table_name_2 (frequency_mhz INT, call_sign VARCHAR)

What is the Frequency MHz for the station with a call sign of w224bn?
SELECT AVG(frequency_mhz) FROM table_name_2 WHERE call_sign = "w224bn"
SELECT AVG("frequency_mhz") FROM "table_name_2" WHERE "call_sign" = "w224bn"