Averaging of three numbers

i want to calulate avegare of three numbers if one number having some error then averge would be calculate of two numbers i want formula for the same.

 

Exm – A-2.2 B-2.4, C= 2.3 Avg= 2.3 correct

A-2.2 B-2.4 C= 2.484 Avg =? we have to calculate only A & B avg as C value has 8 % diffrance from A & B

 

Please help

By: pritesh

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