Table: radio_stations_53
Columns: call_sign
frequency_mhz
city_of_license
erp_w
class
fcc_info

Question: What is the ERP W for K236AM?
SQL: SELECT "erp_w" FROM radio_stations_53 WHERE "call_sign" = 'k236am'

Question: What is the average frequency in MHz for stations with an ERP W of 170?
SQL: SELECT AVG("frequency_mhz") FROM radio_stations_53 WHERE "erp_w" = 170

Question: What is K236AM's lowest frequency in MHz?
SQL: SELECT MIN("frequency_mhz") FROM radio_stations_53 WHERE "call_sign" = 'k236am'

Question: What class is assigned to frequencies lower than 90.5?
SQL: SELECT "class" FROM radio_stations_53 WHERE "frequency_mhz" < 90.5

Question: What class is assigned to frequencies larger than 89.3 with an ERP W of 250?
SQL: SELECT "class" FROM radio_stations_53 WHERE "frequency_mhz" > 89.3 AND "erp_w" = 250