Q6 of 8 Page 293

Show that sum of deviation of the mean from the observations 25 27 19 23 25 31 is zero.

Observations given are 25 , 27, 19 , 23 , 25, 31





Sum of deviations,


= (25 – 25) + (27 – 25) + (19 – 25) + (23 – 25) +(25 – 25) + (31 – 25)


= 0 + 2 – 6 – 2 + 0 + 6


= 0


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