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

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Find the mean of each of the following frequency distributions:
(W)
\( \begin{array}{lccccc}\text { Class interval: } & 25-35 & 35-45 & 45-55 & 55-65 & 65-75 \\ \text { Frequency: } & 6 & 10 & 8 & 12 & 4\end{array} \)
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