Statistics problem..pls help

CS 2515 views 3 replies

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 :)

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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