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 .

7x+8y=-18, 4x-9y=-3 solve the system of equations

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.