typically; that means, basically, they are related to the area under the graph, first moment under the graph and second moment under the graph. Basically, you know, this is first moment. See n equal to 1 represents the moment of the graph and this represents the moment of an (( )) the graph of the curve. Any how, I will not write the various formulas here, but it turns out that, that this is how it is. So, therefore, life begins to get sort of simple.