What is Mike Skinner's Chevrolet's Car #?
CREATE TABLE "power_stroke_diesel_200" (
  "pos" real,
  "car_num" real,
  "driver" text,
  "make" text,
  "team" text
);
SELECT COUNT("car_num") FROM "power_stroke_diesel_200" WHERE "make"='chevrolet' AND "driver"='mike skinner';