Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. 
Returns  
Year  X  Y 
1  11 %  23 % 
2  29  44 
3  18  10 
4  19  24 
5  20  52 
Calculate the arithmetic average return for X. 
Calculate the arithmetic average return for Y.
Calculate the variance for X.

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