Find the mean of each of the following frequency distributions: \( \begin{array}{lccccc}\text { ...

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Find the mean of each of the following frequency distributions:
\( \begin{array}{lccccc}\text { Class interval: } & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \text { Frequency: } & 9 & 12 & 15 & 10 & 14\end{array} \)
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