Writing a model to represent data set ?

Rizzamabob
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What exactly does this mean, i have a set of data and it asks me to write a model for it, and to define all non-arithmetic peices in my model. The data shows no real symmetry or anything. What type of "model" should i be writing ? :confused:
Here is the data.
 

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Homework, right?
 
The data shows no real symmetry or anything.
:confused:

The data shows lots of stuff. For example, I find it quite striking that the data seems to be organized into four bands, and the density on the left is far greater than the density on the right.
 

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