CREATE TABLE table_36715 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " FLOAT, "Jockey" TEXT, "Winner/2nd" TEXT)

Which group has a weight (kg) less than 55?
SELECT "Group" FROM table_36715 WHERE "Weight (kg)" < '55'
SELECT "Group" FROM "table_36715" WHERE "Weight (kg)" < '55'