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Histogram of HN ages.... at midday on a Sunday :-)

sad isn't it?

:-)

I think he means the histogram might look different at a different time.

Why would you call it poisson?

Because it looks like one (compared to Gaussian it's skewed):

http://en.wikipedia.org/wiki/Poisson_distribution

It looks a bit like one, but it could be any group of others. Poisson distributions would be used normally in a circumstance that resembles an arrival process (say hits to a web server), but not for a distribution like ages on a site like this.

27.. phew .. my guess was 16.

I feel better now.