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
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: 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? [/INST] SELECT AVG(frequency_mhz) FROM table_name_55 WHERE erp_w > 250 </s>