Find the mean deviation about the mean ...

Find the mean deviation about the mean for the following data :

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`because barx=(Sigmaf_ix_i)/(Sigmaf_i)=262/33=7.9`
`therefore` M.D. `(barx)=(Sigmaf_i|x_i-barx|)/(Sigmaf_i)=77.9/33=2.36`

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