CREATE TABLE table_49054 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

What is the ERP W for the station whose call sign is K248BJ and whose frequency MHz is higher than 97.5?
SELECT AVG("ERP W") FROM table_49054 WHERE "Call sign" = 'k248bj' AND "Frequency MHz" > '97.5'
SELECT AVG("ERP W") FROM "table_49054" WHERE "Call sign" = 'k248bj' AND "Frequency MHz" > '97.5'