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The geometric mean of P1,..,Pn is
latex2($$Geometric~Mean = \sqrt[n]{\prod_{i=1}^{n} Normalized(P_i)}$$)
where latex2($$Normalized(P_i) = \frac{P_i}{Pn}$$) where n is the referenced execution time. Obviously the geometic mean of the referenced machine is 1.
One of the nice features of Geometric means is that the following property holds:
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