+4  A: 

It looks like you're doing an average of an average in Excel, which is bad math.

http://wiki.answers.com/Q/Is_an_average_of_averages_accurate

David Stratton  2009-09-07 18:15:39
@David: You are absolutely right. Upon doing the weighted average calculation, the result came out the same.
Sung Meister  2009-09-07 18:22:10

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