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Use the Geometric Mean

To average normalized data use the Geometric Mean. Do not use the Arithmetic Mean to average normalized data. The Geometric Mean of n numbers is the product of the numbers to the 1/nth power.

GM = (N1 * N2 * ... * Nn) (1/n)

(ni=1 ai ) (1/n)

media:The Correct Way to Summarize Benchmark Results.pdf