Er Coaster Speeds in North America (miles/hour) Roller Coaster Speeds in Asia (miles/hour) 128 149.1 120 106.9 100 95 93 83 92 80.8 90 80.3 85 78.3 82 71.5 80 69.6 77 68.4 The difference of the means of the two data sets is 10.45 . The mean absolute deviation of the roller coaster speeds in North America is . The mean absolute deviation of the roller coaster speeds in Asia is .