CREATE TABLE table_6158 ("Round" FLOAT, "Player" TEXT, "Position" TEXT, "Nationality" TEXT, "College/Junior/Club Team" TEXT)

What is the sum of the round with the defenceman?
SELECT SUM("Round") FROM table_6158 WHERE "Position" = 'defenceman'
SELECT SUM("Round") FROM "table_6158" WHERE "Position" = 'defenceman'