Which of the following is an outlier in the set of data below? 2, 12, 12, 14, 17, 18, 19 a.2 b.12 c.14 d.19

The answer is choice A) 2

The main cluster of data is the group {12, 12, 14, 17, 18, 19} as they aren't very far apart in distance (plot the values on a number line). The range of this group is 7 since 19-12 = 7. Compare this to the distance from 2 to 12 which is 10 units; a far greater distance than 7. So the value 2 is on its own on an "island" so to speak