What's an average person? I'm trying to picture this, but have trouble. Guy or girl? Average American or average human being? What if any food sources exist? I wouldn't imagine that many would die before day 3 but quite a few people should be able to live indefinitely if they've got a source of food and water.

I have some limited wilderness training and would put myself in the latter category given the environment stated in the OP. Now if you throw in a snowy cold winter or a hot summer we're in a much tougher spot...