Normal Distribution in Library Thing

At library school I took the required course on the role of research.  Each week the professor would draw graphs all over the dry erase board and then with vigor mark out the bell curves on each of them with his marker.  I didn’t much get it then, and I don’t get it now but looking at my Library Thing page this jumped out at me:

Scary isn’t it.  The distribution of stars I award to books I’ve read does indeed form a bell curve.  At least on the integers if not on the half-stars.

Now someone should run a statistical analysis to tell me what this all means.

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