You are investing for your retirement. You put 50% of your money into stock A, with an expected return of 10%, and a standard deviation of 20%. The rest is invested in stock B, with an expected return of 20%, and a standard deviation of 30%. The correlation coefficient between Stock A and Stock B is 0.2. What is the standard deviation of your retirement portfolio?
Group of answer choices
a. 19.6%
b. 3.85%
c. 25%
d. not enough information
olution
Correct option-19.6%
Formula for standard deviation of a portfolio of 2 stocks is given below
Here
w1= Proportion invested in stock A
w2= Proportion invested in stock B
σ1= Standard deviation stock A
σ2= Standard deviation stock B
ρ1,2= CorRelation coffecient between Stock A and Stock B
Putting value in formula
Standard deviation of portfolio=SQRT(.5^2*.2^2+.5^2*.3^2+2*.5*.5*.2*.3*.2)
=0.196214
Thus the correct option is 19.6%
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