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-\documentclass{article}
-\usepackage{german}
-\begin{document}
-Each of the measurements $x_1 < x_2 < \cdots < x_r$ occures
-$p_1$-, $p_2$-$,\ldots,p_r$ times. The mean value and standard deviation
-are then
-\[ x = \frac{1}{n}\sum_{i=1}^r p_i x_i,\qquad s= \sqrt{\frac{1}{n}\sum_{i=1}^r
- p_i(x_i - x)^2} \]
-where $ n = p_1 + p_2 +\cdots+p_r $.
-\end{document}
-