What is the average number of laps for mika salo's arrows car with a grid over 13?
CREATE TABLE "race" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT AVG("laps") FROM "race" WHERE "constructor"='arrows' AND "driver"='mika salo' AND "grid">13;