In government data, a household consists of all occupants of a dwelling unit, while a family consists of two or more persons who live together and are related by blood or marriage. So all families form households, but some households are not families. Here are the distributions of household size and family size in the United States.

Number of persons 1 2 3 4 5 6 7
Household probability 0.27 0.33 0.16 0.14 0.06 0.03 0.01
Family probability 0 0.44 0.22 0.20 0.09 0.03 0.02

a. Make probability histograms for these two discrete distributions, using the same scales.
b. What are the most important differences between the sizes of households and families?