A stock had returns of 18.53 percent. -5.55 percent, 20.78 percent, and 8.87 percent for the past four years. What is the variance of the returns? Multiple Choice 00646 1721 1977 O1434 O1913 A stock had returns of 17.75 percent. -11.68 percent, 23.60 percent, and 13.71 percent for the past four years. What is the standard deviation of the returns? Multiple Choice