What is the average number of rounds that Lance Gibson fought when his record was 1-1?
CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "event" text,
  "round" real,
  "time" text,
  "location" text
);
SELECT AVG("round") FROM "mixed_martial_arts_record" WHERE "record"='1-1';