I'm new to this

I have some contract dollar value data associated with Census Tracts. For 
example: 5 contracts having total value of $24,467 in a given census tract. The 
corresponding average is $4893. 
Now.......when I do an Area of Influence using several sales centers and select 
this data as attributes of the appropriate layer, the resulting Contract data 
seems to be incorrect. By that I mean the total value of the Contracts and the 
Averages do not agree. When i manually divide the Total Contract Amount by the 
number of contracts, this manually computed result does not agree with the AoI 
table results.  And by a significant amount - factor of 2 or more.

Why is this? 

=neal=



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