Which average purse was earned by Erika Wicoff and has a winner's share greater than $9,750?
CREATE TABLE "winners" (
  "year" text,
  "champion" text,
  "country" text,
  "score" text,
  "purse" real,
  "winner_s_share" real
);
SELECT AVG("purse") FROM "winners" WHERE "champion"='erika wicoff' AND "winner_s_share">'9,750';