The mean deviation about the mean for the following data: \( 10,5,18,17,5,8,14,18,21,15,8,17 \) ....

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The mean deviation about the mean for the following data: \( 10,5,18,17,5,8,14,18,21,15,8,17 \) is
(1) \( 29 / 6 \)
(2) 5
\( \mathrm{P} \)
(3) \( 14 / 3 \)
(4) \( 31 / 6 \)



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