Please help me answer these!!

Given the following returns -7%, 21%, 4%, and 36%: the arithmetic average is (Select] the geometric average is (Select] Question 12 5 pts The end-of-year of a risky portfolio will be either $4,300 with 74% probability or $38,600 with 26% probability. Investing in T-bill pays a return of 2% A. If you require a risk premium of 19.8%, what is the expected rate of return? [Select] B. How much are you willing to pay for the portfolio? [Select]