if there are 3 observations 15, 20, 25 then sum of deviation of the observations from their AM is
1) 0
2) 5
3)-5
4) none of these
pls specify reason as i already know the answer. thnx in advance :)
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Statistics problem..pls help
Replies (3)
mean of 15,20,25 = 15+20+25/3 = 20.therefore,15-20 = -5,20-20=0 and 25-20= 5.sum of deviation of the observation from their mean is 20-20 = 0.
Sum of deviation from mean is always zero...
The arithmetic sum of deviations from A.M. is always equal to zero.
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