Thomas forgot that his uncle traveled with the military and has lived in 15 different places since high school. let b represent the set of the number of places where all ten of his family members, including his uncle, have lived after high school.

The difference between set A and set B is the inclusion of data from Thomas's uncle in B. Notice that his uncle has lived in many more places than the rest of the people in the data set. Because of this, the average (mean) of the data set will be greater in B because having an outlier from the rest of the data will shift the mean towards that outlier.

The mean of B is greater than the mean of A.