In: Finance
| 
 Probability  | 
 Future Return - X  | 
 Future Return - Y  | 
| 
 .1  | 
 -10%  | 
 -35%  | 
| 
 .2  | 
 2%  | 
 0%  | 
| 
 .4  | 
 12%  | 
 20%  | 
| 
 .2  | 
 20%  | 
 25%  | 
| 
 .1  | 
 38%  | 
 45%  | 
(A) Computation of RY
| 
Yi (A)  | 
Probability (p) (B)  | 
RY (A)*(B)  | 
| (35) | 0.1 | (3.5) | 
| - | 0.2 | - | 
| 20 | 0.4 | 8.0 | 
| 25 | 0.2 | 5.0 | 
| 45 | 0.1 | 4.5 | 
| Total RY | 14.0 | 
Hence, RY = 14%
(B) Computation of standard deviation of X
| Xi | RX | (Xi - RX) | 
(Xi - RX)^2 (A)  | 
Probability (p) (B)  | 
(Xi - RX)^2 * p (A) *(B)  | 
| (10) | 12 | (22) | 484 | 0.1 | 48.4 | 
| 2 | 12 | (10) | 100 | 0.2 | 20 | 
| 12 | 12 | - | 0 | 0.4 | 0 | 
| 20 | 12 | 8 | 64 | 0.2 | 12.8 | 
| 38 | 12 | 26 | 676 | 0.1 | 67.6 | 
| 148.8 | 
Standard deviation (S.D.) of X = Square root of 148.8
= 12.20%
Coefficent variation of X = (S.D. of X / RX)
= (12.2 / 12)
= 1.016
Coefficent variation of Y = (S.D. of Y / RY)
= (20.35 / 14)
= 1.453
Lower the Standard deviation and Coefficent of variation, better the risk-return trade-off. Since the standard deviation and coefficient variation of Y is higher as compared to X, hence Y is more risky per dollar of return.