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Foundational practice problems focusing on measures of dispersion for ungrouped data: mean deviation about the mean, mean deviation about the median, variance, and standard deviation ($\sigma$).
Key Formulas: $\text{M.D.}(\bar{x}) = \frac{\sum |x_i - \bar{x}|}{n}$, $\sigma^2 = \frac{\sum (x_i - \bar{x})^2}{n} = \frac{\sum x_i^2}{n} - (\bar{x})^2$.
Basic Level Worksheet