Name the average Blank Ends  which has a Shot % smaller than 78, and a Ends Won larger than 43?
CREATE TABLE "round_robin" (
  "country" text,
  "skip" text,
  "ends_won" real,
  "ends_lost" real,
  "blank_ends" real,
  "stolen_ends" real,
  "shot_pct" real
);
SELECT AVG("blank_ends") FROM "round_robin" WHERE "shot_pct"<78 AND "ends_won">43;