Extending models with statistic capabilities

Hi,
I have several models in my app which contain several numerical
attribute.
Ex.: stock model; attributes: bid, ask, value,…
todays_values_of_Google = [ [#Stock: id=1, bid = 1.5, ask = 1.5, value =
1.5, time=…, …], [#Stock: id=2, bid = 1.45, ask = 1.5, value =
1.45,…],… ]

Now I would like to have some statistics. I saw the possibility of open
the
array class and add some functions like:

Class Array
def mean; blabla ; end;

end

But I would like to have the option of telling the attribute on which
to
calculate the mean.

So what would be the best practice for this as I need this on several
model?
1.) A module? How?
Maybe this
def mean(array,attr); #calculate over all items of arrays
attribute
attr… ; end
2.) Modify Classes? Where to do it so all model can access the “new”
methods
of Array (for example)
3.) Somethink else?

Thanks for any help

Chris

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