CREATE TABLE table_36613 ("Weight Division" TEXT, "Winner" TEXT, "Loser" TEXT, "Method" TEXT, "Round" FLOAT, "Time" TEXT)

What was the average number of rounds in the fight where Tank Abbott lost?
SELECT AVG("Round") FROM table_36613 WHERE "Loser" = 'tank abbott'
SELECT AVG("Round") FROM "table_36613" WHERE "Loser" = 'tank abbott'