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उदाहरण 30. निम्न समंक से प्रमाप विचलन की गणना कीजिए : Calculate standard deviation from the following data : \begin{tabular}{|l|c|c|c|c|c|c|c|c|} \hline पद का आकार (Size of Items \( (X) \) & 5 & 10 & 15 & 20 & 25 & 30 & 35 & Total \\ \hline आवृत्ति [Frequency \( (f)] \) & 2 & 7 & 11 & 15 & 10 & 4 & 1 & 50 \\ \hline \end{tabular}

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