What's the average pct for George Felton when he had losses greater than 7?
CREATE TABLE "head_coaches_results" (
  "name" text,
  "years" text,
  "seasons" real,
  "lost" real,
  "pct" real
);
SELECT AVG("pct") FROM "head_coaches_results" WHERE "lost">7 AND "name"='george felton';