It's quite a number of years ago now, but a friend of mine did jury duty on a civil case and they were just told to come up with a figure, so they all just picked a number a random and split the difference between the highest and the lowest. The rationale being that this would be a starting point and there would be further litigation to determine what was "fair".

I think that was Ireland in the 80s or 90s though, I'd "imagine" things are approached with a bit more rigor these days ...