Review the RS variable in the code book. Compute the proportion of the data set in each of the categories. What is the most common of these categories?Calculate the median household income per PUMA within each of three subpopulations: A) households with nobody of age 65 and over; B) households with (exactly) 1 person of age 65 and over; and C) households with 2 or more people of age 65 and over (consult the data dictionary to find the variable that allows you to do this). Report the the shape of the table that has one row for each PUMA and one column for each group A, B, and C. Make sure to save this table to a variable. We will use it later.