Table: radio_stations_13
Columns: call_sign
frequency_mhz
city_of_license
erp_w
class
fcc_info

Question: What is the total erp w of class c3, which has a frequency mhz less than 89.9?
SQL: SELECT COUNT("erp_w") FROM radio_stations_13 WHERE "class" = 'c3' AND "frequency_mhz" < 89.9

Question: What is the call sign with a 222 erp w?
SQL: SELECT "call_sign" FROM radio_stations_13 WHERE "erp_w" = 222

Question: What is the average frequency mhz of the loomis, south dakota city license?
SQL: SELECT AVG("frequency_mhz") FROM radio_stations_13 WHERE "city_of_license" = 'loomis, south dakota'

Question: What is the sum of the erp w of the k222al call sign?
SQL: SELECT SUM("erp_w") FROM radio_stations_13 WHERE "call_sign" = 'k222al'

Question: What is the highest erp w with a 90.5 frequency mhz?
SQL: SELECT MAX("erp_w") FROM radio_stations_13 WHERE "frequency_mhz" = 90.5