user: Question: Call sign K216FO has what average ERP W?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'FCC info']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['K206BP', '89.1 FM', 'Weslaco, TX', 197.0, 'FCC']
SQL:

assistant: SELECT AVG("ERP W") FROM "Table" WHERE "Call sign" = 'K216FO';