What is the sum of Total Regions that have the Year 1954, and a Nebo greater than 447?
CREATE TABLE "population" (
  "year" real,
  "total_region" real,
  "belyando" real,
  "broadsound" real,
  "nebo" real
);
SELECT SUM("total_region") FROM "population" WHERE "year"=1954 AND "nebo">447;