You have been following a stock for the last 10 years. It's return history over this period is 5.93%, 8.79%, 1.57%, 0.89%, 3.12%, 3.53%, 8.50%, 6.25%, 0.18%, 6.73%. What is the arithmetic average return over this period? Select one: O a. 3.48% O b. 7.88% O c. 5.44% O d. 4.55% Clear my choice Using the returns in Question 1 above, what is the standard deviation of returns? Select one: O a. 31.20% O b. 3.12% O c. 2.96% d. 0.05%