What's the sum of ERP W with a Frequency MHz that larger than 97.7?
CREATE TABLE "broadcast_translators_of_wmhr" (
  "call_sign" text,
  "frequency_m_hz" real,
  "city_of_license" text,
  "erp_w" real,
  "height_m_ft" text,
  "class" text,
  "fcc_info" text
);
SELECT COUNT("erp_w") FROM "broadcast_translators_of_wmhr" WHERE "frequency_m_hz">97.7;