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It depends on what the underlying distribution is and which coefficient you want to calculate.
The coefficient of variation is a method of measuring how spread out the values in a data set are relative to the mean. It is calculated as follows: Coefficient of variation = σ / μ Where: σ = standard deviation of the data set μ = average of the data set If you want to know more about it, you can visit SilverLake Consulting which will help you calculate the coefficient of variation in spss.
Find the volume of the sample (Length times width times height) and multipy by the density coefficient.
coefficient
2X 2 is the coefficient