- CFA Exams
- CFA Level I Exam
- Topic 1. Quantitative Methods
- Learning Module 2. Organizing, Visualizing, and Describing Data
- Subject 8. Measures of Dispersion

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**CFA Practice Question**

Which of the following relationships is always correct?

B. SUM (X - XBAR) = 0

C. SUM ((X - XBAR)

D. SUM (X - a) = 0

A. SUM (X) = 0

B. SUM (X - XBAR) = 0

C. SUM ((X - XBAR)

^{2}) = 0D. SUM (X - a) = 0

Correct Answer: B

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**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 |