Question Three
State of Economy |
Probability |
Return on Security A |
Return on security B |
Boom |
0.4 |
18% |
24% |
Normal |
0.5 |
14% |
22% |
Recession |
0.1 |
12% |
21% |
Total Portfolio value = Value of Sec A + Value of Sec B |
=400000+1600000 |
=2000000 |
Weight of Sec A = Value of Sec A/Total Portfolio Value |
= 400000/2000000 |
=0.2 |
Weight of Sec B = Value of Sec B/Total Portfolio Value |
= 1600000/2000000 |
=0.8 |
i
Sec A | |||||
Scenario | Probability | Return% | =rate of return% * probability | Actual return -expected return(A)% | (A)^2* probability |
Boom | 0.4 | 18 | 7.2 | 2.6 | 0.0002704 |
Normal | 0.5 | 14 | 7 | -1.4 | 9.8E-05 |
Recession | 0.1 | 12 | 1.2 | -3.4 | 0.0001156 |
Expected return %= | sum of weighted return = | 15.4 | Sum=Variance Sec A= | 0.00048 | |
Standard deviation of Sec A% | =(Variance)^(1/2) | 2.2 | |||
Sec B | |||||
Scenario | Probability | Return% | =rate of return% * probability | Actual return -expected return(A)% | (B)^2* probability |
Boom | 0.4 | 24 | 9.6 | 1.3 | 6.76E-05 |
Normal | 0.5 | 22 | 11 | -0.7 | 2.45E-05 |
Recession | 0.1 | 21 | 2.1 | -1.7 | 2.89E-05 |
Expected return %= | sum of weighted return = | 22.7 | Sum=Variance Sec B= | 0.00012 | |
Standard deviation of Sec B% | =(Variance)^(1/2) | 1.1 | |||
i
Expected return%= | Wt Sec A*Return Sec A+Wt Sec B*Return Sec B |
Expected return%= | 0.2*15.4+0.8*22.7 |
Expected return%= | 21.24 |
ii
Covariance Sec A Sec B: | ||||
Scenario | Probability | Actual return% -expected return% for A(A) | Actual return% -expected return% For B(B) | (A)*(B)*probability |
Boom | 0.4 | 2.6 | 1.3 | 0.0001352 |
Normal | 0.5 | -1.4 | -0.7 | 4.9E-05 |
Recession | 0.1 | -3.4 | -1.7 | 5.78E-05 |
Covariance=sum= | 0.000242 | |||
Correlation A&B= | Covariance/(std devA*std devB)= | 1 |
iii
Variance | =( w2A*σ2(RA) + w2B*σ2(RB) + 2*(wA)*(wB)*Cor(RA, RB)*σ(RA)*σ(RB)) |
Variance | =0.2^2*0.022^2+0.8^2*0.011^2+2*0.2*0.8*0.022*0.011*1 |
Variance | 0.000170 |
Standard deviation= | (variance)^0.5 |
Standard deviation= | 1.30% |
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