Answer:
The question is incomplete; You manage a risky portfolio with an expected rate of return of 18 percent and a standard deviation of 28 percent. The T-bill rate is 8 percent.
Expected value= (0.3 * 8%) + (0.7 * 18%) =15%
Standard deviation= .7σp = 0.7 × 0.28 = 19.6% .
Explanation: