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"investment portfolio" exercises: sample variance
学习是一个不断积累的过程，每天学习一点，每天进步一点！为了帮助大家更高效地备考2021年CFA考试，正保会计网校每日为大家上新CFA习题供大家练习。让网校与您一起高效备考2021年CFA考试，梦想成真！
Questions 1:
A portfolio has the following returns:
| Portfolio Returns | |
| 2006 | 2.4% |
| 2007 | 9.6% |
| 2008 | -4.0% |
| 2009 | 5.6% |
| 2010 | 4.8% |
| 2011 | -3.2% |
The sample variance of the portfolio is closest to:
A. 0.23%.
B. 0.28%.
C. 0.36%.
Questions 2:
Which of the following types of institutions is most likely to have a long investment time horizon and a higher level of risk tolerance?
A. An endowment
B. An insurance company
C. A bank
View answer resolution
【Answer to question 1】（B）
【analysis】
The sample variance is calculated as the sum of squared deviations from the arithmetic mean.
The formula is shown in the following figure:
【Answer to question 2】（A）
【analysis】
Endowments have a long investment time horizon and a high level of risk tolerance.
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