Which Pos has a Car # smaller than 18, and a Driver of mike skinner?
CREATE TABLE "camping_world_200" (
  "pos" real,
  "car_num" real,
  "driver" text,
  "make" text,
  "team" text
);
SELECT AVG("pos") FROM "camping_world_200" WHERE "car_num"<18 AND "driver"='mike skinner';