Maybe to elaborate a bit:
1. The cumulative row is just the row for the cumulative distribution function (
http://en.wikipedia.org/wiki/Cumulat...ution_function). By definition, the value under 7 will be equal to or higher than the value under 6. I could graph it as well but I like the density graph more which has exactly the same informational value.
2. The "Weighted sums"-row doesn't have any meaningful interpretation by itself. It's just an intermediate step so that I can readily calculate the average proc per minute, which is 6. To be more specific: I take the sum over the # of possible procs times their according probability of occurrence, which is the correct way of calculating the arithmetic mean in this case, since we have a discrete distribution (
http://mathworld.wolfram.com/ArithmeticMean.html).
Just to be clear: I think this is purely an "just for fun" or "academic" discussion