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According to the text, social stratification exists in all societies, in some form.
Mound-Shaped Distribution
A data distribution that is symmetric and bell-shaped, often resembling the normal distribution but not necessarily having its mathematical properties.
Standard Deviation
A measure of the dispersion or variability within a set of numerical data, indicating how spread out the values are from the mean.
Tchebysheff's Theorem
A statistical rule stating that for any dataset, regardless of distribution, a certain minimum percentage of values must lie within a specified number of standard deviations from the mean.
Population Mean
A calculation of the central value among all data points in a population.
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