How many average points did the player with a time/retired of +16.789 and have more laps than 68 have?
CREATE TABLE "race" (
  "driver" text,
  "team" text,
  "laps" real,
  "time_retired" text,
  "grid" real,
  "points" real
);
SELECT AVG("points") FROM "race" WHERE "time_retired"='+16.789' AND "laps">68;