PROBABILITY	X	Y
0.1	- 15%	- 21%
0.3	4	0
0.3	12	18
0.2	18	28
0.1	30	42

a. Calculate the expected rate of return, , for Stock Y.( = 9.90%.) Round your answer to two decimal places.

b. Calculate the standard deviation of expected returns, , for Stock X. ( = 17.40%.) Round your answer to two decimal places.

c. Now calculate the coefficient of variation for Stock Y. Round your answer to two decimal places.