What is the frequency MHz of the ERP W's greater than 250?
CREATE TABLE table_name_55 (frequency_mhz INTEGER, erp_w INTEGER)
SELECT AVG(frequency_mhz) FROM table_name_55 WHERE erp_w > 250
### Context: CREATE TABLE table_name_55 (frequency_mhz INTEGER, erp_w INTEGER) ### Question: What is the frequency MHz of the ERP W's greater than 250? ### Answer: SELECT AVG(frequency_mhz) FROM table_name_55 WHERE erp_w > 250