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Estimate mean deviation and its coeffici...

Estimate mean deviation and its coefficient from the following data:
7,9,13,13,15,17,19,21,23

Text Solution

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`barX=(sumX)/(N)=(137)/(9)=15.22`
Mean Deviation from Mean
`MD_(barx)=(sum|dx|)/(N)=(38.22)/(9)=4.25`
Coefficient of Mean Deviation `=(MD_(barx))/(barX)=(4.25)/(15.22)=0.279`
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