user: ### NOW ANSWER:
Question: What is the ERP W for the station whose call sign is k248bj and whose frequency MHz is higher than 97.5?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['K224BV', 92.7, 'Kingman, Arizona', 82.0, 'D', 'FCC']
SQL:

assistant: SELECT AVG("ERP W") FROM "Table" WHERE "Call sign" = 'k248bj' AND "Frequency MHz" > 97.5;