Stock A
State of Economy | Probability of state of Economy |
Rate of return if state occurs |
Boom | 18% | 22% |
Good | 50% | 20% |
Poor | 26% | 8% |
Bust | 6% | -15% |
p1 = 18%, p2 = 50%, p3 = 26%, p4 = 6%
R1 = 22%, R2 = 20%, R3 = 8%, R4 = -15%
Expected return of stock A = E[RA] = p1*R1 + p2*R2 + p3*R3 + p4*R4 = 18%*22% + 50%*20% + 26%*8% + 6%*(-15%) = 3.96% + 10% + 2.08% + (-0.9%) = 15.14%
Variance of stock A = σA2 = p1*(R1 - E[RA])2 + p2*(R2 - E[RA])2 + p3*(R3 - E[RA])2 + p4*(R4 - E[RA])2 = 18%*(22%-15.14%)2 + 50%*(20%-15.14%)2 + 26%*(8%-15.14%)2 + 6%*(-15%-15.14%)2 = 0.0008470728+0.00118098+0.0013254696+0.0054505176 = 0.00880404
Standard deviation is square root of variance
Standard deviation of stock A = σA = (0.00880404)1/2 = 9.38298459979553% ~ 9.38% (Rounded to two decimals)
Stock B
State of Economy | Probability of state of Economy |
Rate of return if state occurs |
Boom | 0.30 | 0.25 |
Good | 0.50 | 0.16 |
Poor | 0.14 | 0.06 |
Bust | 0.06 | -0.10 |
p1 = 0.30, p2 = 0.50, p3 =0.14, p4 = 0.06
R1 = 0.25, R2 = 0.16, R3 = 0.06, R4 = -0.10
Expected return of stock B = E[RB] = p1*R1 + p2*R2 + p3*R3 + p4*R4 = 0.30*0.25 + 0.50*0.16 + 0.14*0.06 + 0.06*(-0.10) = 7.5% + 8% + 0.84% + (-0.6%) = 0.1574
Variance of stock B = σB2 = p1*(R1 - E[RB])2 + p2*(R2 - E[RB])2 + p3*(R3 - E[RB])2 + p4*(R4 - E[RB])2 = 0.3*(0.25-0.1574)2 + 0.5*(0.16-0.1574)2 + 0.14*(0.06-0.1574)2 + 0.06*(-0.1-0.1574)2 = 0.002572428+0.00000338+0.0013281464+0.0039752856 = 0.00787924
Standard deviation is square root of variance
Standard deviation of stock B = σB = (0.00787924)1/2 = 8.87650832253314% ~ 8.88% (Rounded to two decimals)
i) Standard deviation of stock A = σA = 9.38%
ii) Standard deviation of stock B = σB = 8.88%
Stock A has a higher standard deviation (9.38%) than stock B (8.88%) as volatility in returns is higher in case of stock A
3) You have been provided the following information related to Stock A (Canadian Stock) and Stock...
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B. 2.08; 2.76
C. 3.21; 3.84
D. 4.47; 3.89
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