Mean
Question
Five numbers are given: (5, 10, 15, 5, 15). Now, what would be the sum of deviations of individual data points from their mean?
A) 10
B)25
C) 50
D) 0
E) None of the above
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Answers ( 2 )
D)0
As the sum of deviations about the mean value is ALWAYS zero.
Mean = (5+10+15+5+15)/5
Mean = 10
Total deviation from mean = (5-10)+(10-10)+(15-10)+(5-10)+(15-10)
= -5+0+5-5+5
= 0
Sum of deviation from Mean for individual points = 0