First step in statistics: something-like-a-mode for a sequence where each value is different from another Sorry but I'm not a statics expert at all, but I'm following some on line course and it is fascinating me.
I just found the existence of the mode: 

The mode is the value that appears most often in a set of data. (Wikipedia)

What about a sequence where the values are different one from each other? Like
l = [1, 1.2, 1.3, 0.9, 12, 5]

I'd like to take out from this sequence a value that is not the average (that is 3.5) because it is not explicative enough so I thought to discretize (like [1, 1, 1, 1, 12, 5]) them and then take the mode (that would be 1) but I'm sure that there is a better way.

There's no uniquely Right Way to define the concept that you're grasping at, but you're not alone in wanting to do so. The (ill-defined) problem you're trying to solve is called cluster analysis, and there's an entire field of research dedicated to it.
