According to the 2015 American Community Survey, in 2012 the United States had 30.1 million households with one person, 37.1 million with two persons, 17.8 million with three persons, 15.0 million with four persons, and 10.4 million with five or more persons.

(a) Construct a relative frequency distribution.

(b) Sketch a histogram. What is its shape?

(c) Report and interpret the (i) median, (ii) mode of household size.