This means that the top 100 contributors (https://news.ycombinator.com/leaders) plus PG (https://news.ycombinator.com/user?id=pg) account for only about 10% of the total karma (3222034 points as of the moment). I expected their part to be greater. I should say "sorry" to the average HN user for underestimating his impact. :-)
Right and there's about 9 million items, so average is 4 points per item. I don't feel the average is very meaningful in this case. I'd also want to know, range, median and mode and a frequency histogram for the 100 largest, 100 frequent, and 100 rarest item scores.