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Calculate the mean, median and standard deviation of the following distribution: \( \begin{array...
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Calculate the mean, median and standard deviation of the following distribution:
\( \begin{array}{lcccccccc}\text { Class-interval: } & 31-35 & 36-40 & 41-45 & 46-50 & 51-55 & 56-60 & 61-65 & 66-70 \\ \text { Frequency: } & 2 & 3 & 8 & 12 & 16 & 5 & 2 & 3\end{array} \)
\( \begin{array}{lcccccccc}\text { Class-interval: } & 31-35 & 36-40 & 41-45 & 46-50 & 51-55 & 56-60 & 61-65 & 66-70 \\ \text { Frequency: } & 2 & 3 & 8 & 12 & 16 & 5 & 2 & 3\end{array} \)
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