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I need to find the geometric mean of 0 and 600. Would it just be the square root of 600? I know that the formula is $$ \bar x_{\mathrm{GM}} = \left(x_1 x_2 \cdots x_n\right)^{1/n}, $$ but in this case one of my values is 0, so I'm not sure.

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nop, it's 0. Geometric means is 0 whenever any single one of the x_i is not strictly positive.... – user603 Mar 22 '12 at 21:34

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I think you should trust the formula: it is zero. (Whether it is useful to talk about the geometric mean of a list including zero is a different question.)

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