Find the a, mean and b. standard deviation for the data set. Round to two decimal places. International Travel Destinations of U.S. Citizens Country U.S. Citizens, in thousands 992 592 212 192 152 97 H I 95 94 1 82 72 O a. 258 b. 300.55 © a. 252 b. 9000 a. 252 b. 300.55 • a. 258 b. 9000