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

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Find the mean of each of the following frequency distributions:
(W)
\( \begin{array}{lcccccc}\text { Class interval: } & 50-70 & 70-90 & 90-110 & 110-130 & 130-150 & 150-170 \\ \text { Frequency: } & 18 & 12 & 13 & 27 & 8 & 22\end{array} \)
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