The table below shows historical annual returns for stocks of companies X and Y over recent years. Calculate the arithmetic average returns. In addition, calculate their historical variances, as well as their historical standard deviations.

	Returns
Year	X	Y
1	7 %	24 %
2	25	45
3	14	-9
4	-15	-23
5	16	53

Requirement 1:
(a)	The arithmetic average return of company X's stock is:
	(Click to select) 9.40% 10.62% 11.47% 7.61% 11.75%

(b)	The arithmetic average return of company Y's stock is:
	(Click to select) 14.58% 22.50% 21.96% 20.34% 18.00%

Requirement 2:
(a)	The historical variance of company X's stock returns is: (Do not round intermediate calculations.)
	(Click to select) 0.028412 0.018411 0.027950 0.022730 0.022360

(b)	The historical variance of company Y's stock returns is: (Do not round intermediate calculations.)
	(Click to select) 0.103314 0.089100 0.129143 0.110000 0.137500

Requirement 3:
(a)	The historical standard deviation of company X's stock returns is: (Do not round intermediate calculations.)
	(Click to select) 12.21% 16.72% 18.85% 15.08% 14.85%

(b)	The historical standard deviation of company Y's stock returns is: (Do not round intermediate calculations.)
	(Click to select) 26.86% 41.46% 33.17% 35.94% 32.14%