Problem: On the basis of a one factor model, consider a portfolio of two securities with the following characteristics :
Security Factor Sensitivity Nonfactor risk proportion
A .20 49 .40
B 3.50 100 .60
1) If the standard deviation of the factor is 15% , what is the factor risk of the portfolio ?
2) What is the nonfactor risk of the portfolio ?
3) What is the portfolio's standand deviation ?