CFA Practice Question

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CFA Practice Question

Which of the following relationships is always correct?

A. SUM (X) = 0
B. SUM (X - XBAR) = 0
C. SUM ((X - XBAR)2) = 0
D. SUM (X - a) = 0
Correct Answer: B

User Contributed Comments 3

User Comment
BeeBee Why is SUM(X-XBAR)=0 and SUM((X-XBAR)square)is not???
DAS11 when you square a number it can not be negative, therefore the numbers will not sum to 0
leosbar x-xbar=0 ; 0square=1
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