what is the average starts when the chassis is focus rs wrc 08 and finishes is more than 27?
CREATE TABLE "constructors" (
  "constructor" text,
  "chassis" text,
  "starts" real,
  "finishes" real,
  "wins" real,
  "podiums" real,
  "stage_wins" real,
  "points" real
);
SELECT AVG("starts") FROM "constructors" WHERE "chassis"='focus rs wrc 08' AND "finishes">27;