What is the average round for draft pick #49 from Notre Dame?
CREATE TABLE "1978_pittsburgh_steelers_draft_selection" (
  "round" real,
  "pick_num" text,
  "player" text,
  "position" text,
  "college" text,
  "tenure_w_steelers" text
);
SELECT AVG("round") FROM "1978_pittsburgh_steelers_draft_selection" WHERE "college"='notre dame' AND "pick_num"='49';