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Calculating returns and Variability: Using the following returns, calculate the average returns, the variances and the standard deviations for X and Y

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Calculating returns and Variability: Using the following returns, calculate the average returns, the variances and the standard deviations for X and Y.
Returns
Year X Y
1 16% 34%
2 18% -7%
3 -9% -12%
4 21% 41%
5 2% 10%