Using the following returns, calculate the average returns, the variances, and the standard deviations for X and Y. (Note that the book covers both the "arithmetic" and the "geometric" averages. Here, calculate the regular "arithmetic" average returns. These are the average returns covered in the course lecture.

Year	X	Y
1	10 %	25 %
2	28	46
3	17	-9
4	-18	-23
5	19	54

1: (a) Calculate the average return for X.

(b) Calculate the average return for Y.

2: (a) Calculate the variance for X. (Do not round intermediate calculations.)

(b) Calculate the variance for Y. (Do not round intermediate calculations.)

3: (a) Calculate the standard deviation for X. (Do not round intermediate calculations.)

(b) Calculate the standard deviation for Y. (Do not round intermediate calculations.)