What is the total decile with an Authority of state, and a Name of newfield park school?
CREATE TABLE "invercargill_city" (
  "name" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT SUM("decile") FROM "invercargill_city" WHERE "authority"='state' AND "name"='newfield park school';