A stock has yielded retums of 6.63 percent, 10 percent, 17.85 percent, and -9.72 percent over the past four years, respectively. What is the standard deviation of these returns? 2.5 pts D Question 26 Cooper issued 28 year bonds 9 years ago at a coupon rate of 8.97 percent. The bonds make semiannual payments. If the YTM on these bonds is 14.87 percent, what is the current bond price? Round your answer to 2 decimal places. 2.5 pts D Question 27 A stock produced returns of 12 percent, 22 percent, and 6 percent over three of the past four years, respectively. The arithmetic average for the past four years is 19 percent. What is the standard deviation of the stock's returns for the four-year period? Write your answer in percentage form, and round your answer to 2 decimal places. For example, put 9.29. not 0.93