Consider two securities X and Y with the following 5 annual returns:
X: +10%, +3%, -2%, +3%, +5%
Y: +7%, -2%, +3%, -5%, +10%
In this case the sample covariance between the two time series can be calculated as:
A . 0.40729
B . 0.00109
C . 0.00087
D . 0.32583
Answer: B
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