if you kill 20 mobs per hour and every mob has a 0.2% chance to drop the hilt, than is the expected value for farming time till drop 25 hours.
Geometric distribution - Wikipedia, the free encyclopedia
if you kill 20 mobs per hour and every mob has a 0.2% chance to drop the hilt, than is the expected value for farming time till drop 25 hours.
Geometric distribution - Wikipedia, the free encyclopedia