State of Economy | Probability | Stock A return | Stock B return |
Recession | 0.2 | 0.05 | -0.2 |
Normal | 0.57 | 0.08 | 0.09 |
Boom | 0.23 | 0.13 | 0.26 |
Expected Return
Expected Return when the probabilities of different state of economies are given is calculated using the formula:
Expected return = E[R] = p1*R1 + p2*R2 + p3*R3
Expected return for Stock A = E[RA] = 0.2*0.05 + 0.57*0.08 + 0.23*0.13 = 0.01 + 0.0456 + 0.0299 = 0.0855 = 8.55%
Expected return for Stock B = E[RB] = 0.2*(-0.20) + 0.57*0.09 + 0.23*0.26 = -0.04 + 0.0513 + 0.0598 = 0.0711 = 7.11%
Standard Deviation
Variance of the return, when different state of economies are given, can be calculated using the below formula:
Variance = σ2 = p1*( R1 - E[R])2 + p2*( R2 - E[R])2 + p3*( R3 - E[R])2
For A
E[RA] = 0.0855
Variance of stock A = σA2 = 0.2*( 0.05-0.0855)2 + 0.57*( 0.08-0.0855)2 + 0.23*( 0.13-0.0855)2 = 0.00072475
Stadard Deviation is square-root of varance
Standard Deviation of A = σA = (0.00072475)1/2 = 0.0269211812519436 = 2.69211812519436% ~ 2.69%
For B
E[RA] = 0.0711
Variance of stock B = σB2 = 0.2*(-0.20-0.0711)2 + 0.57*( 0.09-0.0711)2 + 0.23*(0.26-0.0711)2 = 0.02310979
Stadard Deviation is square-root of varance
Standard Deviation of B = σB = (0.02310979)1/2 = 0.152019044859518 = 15.2019044859518% ~ 15.20%
Answer
Stock A expected return | 8.55 | % |
Stock B expected return | 7.11 | % |
Stock A standard deviation | 2.69 | % |
Stock B standard deviation | 15.20 | % |
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