What is the average Worst score for Mario Lopez as the Best dancer and Tango as the Dance?
CREATE TABLE "highest_and_lowest_scoring_performances" (
  "dance" text,
  "best_dancer" text,
  "best_score" real,
  "worst_dancer" text,
  "worst_score" real
);
SELECT AVG("worst_score") FROM "highest_and_lowest_scoring_performances" WHERE "best_dancer"='mario lopez' AND "dance"='tango';