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Normalize: Given a reference execution time A, take the execution time you have (B) and divide it by the reference execution time. What you get is a normalized execution time of B with respect to A. 

                    Excution time of B
Normalized(B) = ----------------------------
                 Reference Execution Time A

Given several programs P1, P2, ..., Pn, the average normalized execution time is 

 For (i=1; i++, <= n) {
   P *= Normalized(Pi) 
 }
 return P^(1/n)

or
       _____________
      / n
   n / __
   \/  ||  Normalized(Pi)
       i=1

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