[sam h]

This is a cool idea.

I don't know about the conclusions, though, as the distributions look pretty normal to me. The variance is pretty high, so even with a lot of observations its not that surprising to see things look kind of choppy.

Another suggestion to redo the graphs using the same number of "bins" (divisions for bars) in each histogram. You have a lot more bins in the first couple, which makes things look slower to converge on a normal than they probably are.

I think something might be wrong with your BB/100 histogram. It doesn't look like there are 1500 observations there.