an investor borrows $5,000 at the risk free rate of 4% and invests this $5,000 together with her own $10,000 in a risky portfolio p. portfolio p has an expected return of 10% and a return volatility of 15%. her portfolio's expected rate of return and standard deviation are approximately and respectively 11%, 16.5% 13%, 22.5% 15.8%, 21% 17%, 18%