3.4. According to the 2005 American Community Sur- vey, in 2005 the United States had 30.1 million households with one person, 37.0 million with two persons, 17.8 million with three persons, 15.3 mil- lion with four persons, and 10.9 million with five or more persons.

(a) Construct a relative frequency distribution.

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

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