What is the expected return and standard deviation of a portfolio consisting of $9600 invested in a risk-free asset with an 8.7-percent rate of return, and $3200 invested in a risky security with a 20.7-percent rate of return and a 25.7-percent standard deviation? 19.275 percent, 17.70 percent 11.70 percent, 6.425 percent 17.70 percent, 19.275 percent 6.425 percent. 11.70 percent