In: Finance
You have a portfolio with a standard deviation of 26% and an expected return of 19%. You are considering adding one of the two shares in the table below. If after adding the shares you will have 20% of your money in the new shares and 80% of your money in your existing portfolio, which one should you add?
| 
 Expected return  | 
 Standard deviation  | 
 Correlation with your portfolio's returns  | 
|
| 
 Share A  | 
 13%  | 
 25%  | 
 0.4  | 
| 
 Share B  | 
 13%  | 
 17%  | 
 0.5  | 
Standard deviation of the portfolio with share A is .................. %. (Round to two decimal places.)
Standard deviation of the portfolio with share B is .................. %. (Round to two decimal places.)
Which share should you add and why? (Select the best choice below.)
A. Add A since the portfolio is less risky when A is added.
B. Add B because the portfolio is less risky when B is
added.
Standard Deviation of the portfolio with Share A:
Formula:

where,
Xa= Weight in Portfolio = 80%
Xb= Weight in Share A = 20%
a=
Standard deviation in portfolio= 26%
b=
Standard deviation in Share A= 25%
Pab= Correlation with portfolio's returns= 0.4
=
=
=
=
Ans = 23.26%
Standard Deviation of the portfolio with Share B:
where,
Xa= Weight in Portfolio = 80%
Xb= Weight in Share B = 20%
a=
Standard deviation in portfolio= 26%
b=
Standard deviation in Share B= 17%
Pab= Correlation with portfolio's returns= 0.5
=
= 
=
=
Ans = 22.69%
Comment:
Standard Deviation of the portfolio with Share A = 23.26%
Standard Deviation of the portfolio with Share B = 22.69%
Add Share B, since the standard deviation of the portfolio is less risky when share B is added.