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"investment portfolio" exercises: sample variance
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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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