Reducing column size through averaging?

R

raymond_b_jimenez

I'm trying to reduce a lengthly column by averaging several lines, in
another column, like the example below (averaging every 3 lines):

1 2
2 5
3 8
4 11
5
6
7
8
9
10
11
12

How can I do this easily in Excel?
rj
 
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