RE: More than $1B Oogee,
I know you like to understand what lies behind ... so here it is..
On point 1. For this kind of report (Pellegrino), the mean is not calculated by dividing the number of scenario as a conventional mean. If you noticed, Pellegrino has used the "Monte Carlo" method which means that the more one is near the average, the higher the probability is high. In fact, the probability corresponds to a normal curve (I assume you know what it is..). the median is given as information to demonstrate that the curve is a bit "out of phase". So for this kind of model, there is less than 1% probability that the scenario of the highest or lowest price is realized (and the gap is usually quite large), and more than 80% probability that the price is close to the average. Of course, in a perspective that all the "key assumptions" are in place.
CF