user: Question: What's the sum of ERP W with a Frequency MHz that larger than 97.7?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Height m ( ft )', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text', 'text']
Sample row: ['W201CY', 88.1, 'Dansville, NY', 10.0, 'm (ft)', 'D', 'FCC']
SQL:

assistant: SELECT SUM("ERP W") FROM "Table" WHERE "Frequency MHz" > 97.7;