A rock specimen was tested under compression. The lateral and longitudinal strains were found to be \(0.8\%\) and \(4\%\) respectively. The Poisson's ratio of the specimen is
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Poisson's ratio is
\[
\boxed{
\mu
=
\frac{\text{Lateral strain}}
{\text{Longitudinal strain}}
}
\]
(using the magnitudes of the strains).