Name the average round where Dave Stachelski was picked smaller than 187.
CREATE TABLE "2000_new_england_patriots_draft_selectio" (
  "round" real,
  "overall" real,
  "player" text,
  "position" text,
  "college" text
);
SELECT AVG("round") FROM "2000_new_england_patriots_draft_selectio" WHERE "overall"<187 AND "player"='dave stachelski';