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Find the mean deviation by short cut met...

Find the mean deviation by short cut method.

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Let `a=45, h=10`
Arithmetic mean `barx=a+(sumf_(i)(u_(i)))/(sumf_(i))xxh`
`=45+0/40xx10=45`
Mean deviation `=(sumf_(i)|x_(i)-barx|)/(sumf_(i))`
`=400/40=10`
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