You can also die if you slip on a banana peel and fall awkwardly, but the third floor isn't nearly high enough to be safe. Don't do that!
This is no joke, in the US around 17,000 people die each year from slipping and tripping at ground level. It's also a leading cause of brain injuries and spinal cord injuries.
If you're not elderly and frail, you should look for something at least 150 feet, or around 15 stories, for reasonable confidence of death.
i have other methods in mind but jumping would for sure be the easiest one. my dorm is on the third floor, but i'm scared to end up with just two broken legs. if i fall right, what are the chances i'd die on impact? or is it better to look into other methods?
I would not be so scared of a couple of broken legs, that would be a lucky outcome. I'd be scared of widespread fractures, major trauma to internal organs, spinal cord injury, and brain injury. Falling from that height could easily leave you in a wheelchair, or with loss of brain function having to relearn basic things like how to speak again, or trapped in bed in a vegetative state.