Let’s say you have the advantage of being strapped in the chute properly but that’s it. You’re in the plane, the “instructor” pushes you out and your left to your own devices.
What is the likelihood of surviving with out injury or death?
Without injury? Pretty slim. At the least you’ll probably end up with a twisted ankle. Maybe a broken leg.
Most people know that you pull a ripcord to open a parachute. But here’s the thing- most skydivers don’t use ripcords, they use a hand-deployed pilot chute, stored in a pouch on the bottom of the backpack/container. Without instruction, you are unlikely to know where the handle is and you may not get your parachute deployed before impact.
There is a ripcord for the reserve parachute. You might see that handle and pull it, which would deploy the reserve canopy, so you only have to survive the landing.
Are those altitude meters that deploy automatically at a preset altitude not standard gear?
They are not standard gear but they might as well be- the great majority of skydivers have them installed, and I believe all student (rental) gear in the US is equipped with automatic openers.
Well then, which way is down?
What about that device that deploys the parachute when you scream loud and long enough?
They got rid of it. It kept deploying on the planes.
Yer gonna bounce.
That’s called a Tandem Instructor and he should be strapped to your back, between you and the parachute.
I’ve had people strapped to my back before, but they never came with their own parachutes. What will they think of next?
In terms of force of impact: If hitting the ground with a parachute is the same force as going off a roof x feet high, what is x?
X could be 1 or less. If you time it right, a soft tip-toe stand-up landing is possible.
Here are some landings to give an idea of how easy it can be.
This is from way back in the past, sometime in the forties. I only relate this, as I seen it on one of those ww2 youtube videos. Dude was sitting on the bed of a pick up truck driving at 12 miles an hour. Was supposed to simulate the parachute touch down, with regards to the impact force of the feet touching down.
Declan
But those people know how to deal with a chute and when to flare for the landing. Someone who just got tossed out of an airplane wouldn’t know that, and would probably bung themselves up a bit.
Oh, absolutely. That’s why in post #2 I said “Without injury? Pretty slim. At the least you’ll probably end up with a twisted ankle. Maybe a broken leg.”
I wasn’t considering PastTense’s question as part of the OP’s hypothetical, I was answering it as a stand-alone question.
In which case you are, of course, completely right! 
I can’t find a cite but I recall reading somewhere that when the French were fighting in Vietnam, they parachuted in troops who had had no parachute training and experienced an insignificant increase in injuries. Of course, the newbie parachutists were fit soldiers which likely made a difference.
Also, they were using round parachutes which require a lot less training. Plus, the parachute was attached to the airplane with a static line, so a paratrooper only has to jump out- the canopy will deploy automatically.
I agree with Bumbershoot, if you can get the chute open & land in an appropriate place, you’ll survive. An appropriate place being a field or parking lot & not the middle of a large lake, a prison yard, the roof of a motorcycle gang club house, or an interstate*.
- The place I learned was alongside an interstate. One guy landed on the other side of it. :smack: (Ram-air (Rectangular) parachutes are steerable.)
BTW, you may want to jump with Bumbershoot, but not a bumbershoot; they really don’t hold up so well.
Another thing to consider is body orientation when the jumper opens the chute. Jumpers know how to arch their backs and while in flight use coordinated movements to stay stable. A person who has never done this may not be able to orient themselves at all. If they open their parachute in a bad position they could more easily end up with tangled lines, or even sustain injury if they get tossed around when the chute opens.