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Find the mean deviation about the mean o...

Find the mean deviation about the mean of the distributon .

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The correct Answer is:
N/a

Now `M_(e)=(20+1/(2)) th item =(21/2)=10.5 th item`
`therefore M_(e)=12 `
`therefore MD=(Sigmaf_(i)d_(i))/(Sigma f_(i))=(25)/(20)=1.25`
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