Problem: The data in the file "states.xls" represent the results of the American Community Survey, a sampling fo households taken in all states during the 2000 US Census.  For each of the variables average travel-to-work time in minutes, percentage of homes with eight or more rooms, median household income, and percentage of mortgage paying homeowners whose housing costs exceed 30% of income:

1. Construct a frequency distribution and a percentage distribution
2. Construct a histogram and percentage polygon
3. Construct a cumulative percentage distribution and plot a cumulative percentage polygon.
4. What conclusions about these four variables can you make based on the results of "a" thru "c".

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