Question

What is AD, SD, QD ? Mention needs or importance of AD, SD, QD.​

Answer 1

Given : AD, SD, QD

To Find :  What are they

Solution:

AD = Average Deviation also called  Mean Deviation

Mean Deviation  = ∑ | xi - Mean| /n

QD = Quartile Deviation

Quartile Deviation  =  {( Q₂ - Q₁ ) + (Q₃ - Q₂)}/2

= (Q₃ - Q₁)/2

SD =  √ (∑(xi - Mean)² /n)  for population

SD = √( ∑(xi - Mean)² /(n-1))   for population

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