what is the average wins when percent is more than 0.4 and teams is chargers~?
CREATE TABLE "quarterbacks_sorted_by_win_percentage" (
  "quarterback" text,
  "games" real,
  "teams" text,
  "wins" real,
  "losses" real,
  "percent" real
);
SELECT AVG("wins") FROM "quarterbacks_sorted_by_win_percentage" WHERE "percent">0.4 AND "teams"='chargers~';