What is the average value of Overall, when Round is greater than 11, and when Pick is greater than 10?
CREATE TABLE "washington_redskins_draft_history" (
  "round" real,
  "pick" real,
  "overall" real,
  "name" text,
  "position" text,
  "college" text
);
SELECT AVG("overall") FROM "washington_redskins_draft_history" WHERE "round">11 AND "pick">10;