Name the total number of top 10 for avg start being 37.3
CREATE TABLE "nationwide_series" (
  "year" real,
  "starts" real,
  "wins" real,
  "top_5" real,
  "top_10" real,
  "poles" real,
  "avg_start" text,
  "avg_finish" text,
  "winnings" text,
  "position" text,
  "team_s" text
);
SELECT COUNT("top_10") FROM "nationwide_series" WHERE "avg_start"='37.3';