How many U.S. viewers in millions watched the number 7 episode in the series that was written by Jed Spingarn?
CREATE TABLE "table1_25246990_2" (
  "no_in_series" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "u_s_viewers_millions" text,
  "original_u_s_air_date" text,
  "prod_code" text
);
SELECT "u_s_viewers_millions" FROM "table1_25246990_2" WHERE "written_by"='Jed Spingarn' AND "no_in_series"='7';