Find the mean deviation about the mean for the data \( \begin{array...

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Find the mean deviation about the mean for the data
\( \begin{array}{llllll}x_{i} & 5 & 10 & 15 & 20 & 25 \\ f_{i} & 7 & 4 & 6 & 3 & 5\end{array} \)
\( \mathrm{P} \)
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