. States. The stem-and-leaf display shows populations of the 50 states and Washington, DC, in millions of people, according to the 2000 census. a) What measures of center and spread are most appropriate? b) Without doing any calculations, which must be larger: the median or the mean? Explain how you know. c) From the stem-and-leaf display, find the median and the interquartile range. d) Write a few sentences describing this distribution.