Posted by Amelia on Friday, October 19, 2012 at 8:23am.
I searched Google under the key words "weighted mean and arithmetic mean" to get these possible sources:
http://search.aol.com/aol/search?query=weighted+mean+and+arithmetic+mean&s_it=client-addressbarmac-unauth
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
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