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Question

The algebraic sum of the deviations of a set of n values from their mean is

A
0
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B
n1
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C
1
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D
n
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Solution

The correct option is B 0
Let A.M. of x1,x2,....xn=x1+x2+....+xnn=K

Mean deviation =n1(xK)n=x1K+x2K+....+xnKn=x1+x2+....+xnnKn=x1+x2+....+xnnK
KK=0

Hence, the algebraic sum of the deviations of a set of n values from their mean is 0

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