Question 16 25 pts Astock produced returns of 15 percent, 21 percent, and 6 percent over three of the past four years, respectively. The arithmetic average for the past four years is 16 percent. What is the standard deviation of the stock returns for the four year period? Write your answer in percentate form and round your answer to 2 decimal places for example, put 9 29. not 09 Question 17 2.5 pts Astock helded returns of 117 percent, 10 percent, 24.17 percent and -9.02 percent over the past four years, respectively What is the standard deviation of these returns! Question 18 2.5 pts Suppose you received an $2.966 scholarship today. You choose to deposit that $2.966 into a financial account that can earn an interest of 6%.compounded semiannually for 4 years. How much money will you have in that account in 4 years? Round your answer to the nearest integer