a) The expected return of a security is calculated from the following formula:
Expected return = p1*r1 + p2*r2 + ........pn*rn
Where, r is the expected return in a given scenario
p is the probability of return in a given scenario
Therefore, Expected return of stock A = 0.1*25 +0.2*18 + 0.3*10 +0.2*0 + 0.2*(-8)
= 7.5%
Expected return of stock B = 0.1*0 + 0.2*4 +0.3*8 + 0.2*12 + 0.2*16
= 8.8%
Expected return of market index = 0.1*15 + 0.2*10 + 0.3*6 + 0.2*0 + 0.2*(-4)
= 4.5%
b) Expected return on portfolio= (Return on Stock A * Weight of stock A) + (Return on Stock B* Weight of Stock B)
Weight of stock is calculated as stock value/Total investment
Expected return on portfolio = 7.5 *(3000/8000) + 8.8*(5000/8000)
= 8.3125 %
Standard deviation of portfolio is calculated as
Where, w1 is weight of stock 1
w2 is weight of stock 2
is standard deviation of stock 1
is standard deviation of stock 2
is standard deviation of portfolio
Weight of stock A = 3000/8000 = 0.375
Weight of stock B = 5000/8000 = 0.625
Therefore standard deviation of portfolio AB =
= 0.94%
c) Beta of stock = E(rx)-rf / E(rm) - rf
Where, E(rx) is expected return of stock x
rf is risk free rate
E(rm) is expected return of market
Beta of stock A = 7.5-2 / 4.5-2
= 2.2
Beta of stock B = 8.8-2 / 4.5-2
= 2.72
d). Required return if CAPM holds = rf + Beta*(rm - rf)
Required return of stock A = 2 + 2.2*(4.5-2) = 7.5%
Stock A is correctly priced since its required return equals expected return
Required return of stock B = 2 + 2.72*(4.5-2) = 8.8%
Stock B is also correctly priced since its required return equals expected return
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