25, 8, 10, 35, 5, 45, 40, 30, 20 What is the upper quartile of the data set above? A. 35

B. 37.5

C. 37

D. 40,

An upper quartile is the range of numbers above the median in a set. Thus, the numbers have to be rearranged mentally or on paper. Fortunately, there are an odd set of numbers, so one number, 25, is the median. The upper quartile is 30, 35, 40, 45.