I am working with a collection of integer sequences ...(e.g.
coll:
((3 7 3 5 9 2 0 8 4 0 1 2323 4 11...) (243 4 664 478 3948...) (6 3 7 4
3335 2 4 5 7 6...)...)

I want to create an average sequence such that all of the first
elements are averaged, all of the second elements, etc....

However, I am unable to manipulate the collection.  If I try something
simple like:

(map + coll)

I get java.lang.ClassCastException

I understand that this is because map is trying to apply + to an
entire sequence, but cannot figure out how to remove the parenthesis
which enclose this collection.

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