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Find the mean deviation about the mean f...

Find the mean deviation about the mean for the data : `4, 7, 8, 9, 10 , 12 , 13 , 17`

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Here `n=8`
`:.` Mean `barx=(sumx_(i))/n=80/8=10`
Mean deviation `=(sumd_(i))/n=24/8=3`
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