Calculate mean, variance and standard deviation of the following frequency distribution \( \begi...

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Calculate mean, variance and standard deviation of the following frequency distribution
\( \begin{array}{lcccccc}\text { Class: } & 1-10 & 10-20 & 20-30 & 30-40 & 40-50 & 50-60 \\ \text { Frequency: } & 11 & 29 & 18 & 4 & 5 & 3\end{array} \)
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