- CFA Exams
- CFA Level I Exam
- Topic 1. Quantitative Methods
- Learning Module 3. Statistical Measures of Asset Returns
- Subject 2. Measures of Dispersion
CFA Practice Question
If you are told a population has a mean of 25 and a variance of 0, what must you conclude?
A. Someone has made a mistake.
B. There is only one element in the population.
C. All the elements in the population are 25.
User Contributed Comments 5
| User | Comment |
|---|---|
| Daddykay | eg consider a pop with elements: 25,25,25 Mean=75/3=25 Var=0 |
| bashg | Can it also be that there is only one element in the population. That element being 25 Mean 25/1 =25 var = 0 |
| rana1970 | But option B never say that one element is 25 |
| JonClark | Yes, B can be correct... But it's not the only possible population. The question asks, "what must you conclude?" |
| Shaan23 | Thats not easy...it is but not at the same time... |