The following cross tabulation shows household income by educational level of the head of household (Statistical Abstract of the United States: 2008).

a. Compute the row percentages and identify the percent frequency distributions of income for households in which the head is a high school graduate and in which the head holds a bachelor's degree.
b. What percentage of households headed by high school graduates earn $75,000 or more? What percentage of households headed by bachelor's degree recipients earn $75,000 or more?
c. Construct percent frequency histograms of income for households headed by persons with a high school degree and for those headed by persons with a bachelor's degree. Is any relationship evident between household income and educational level?

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Household Income ($1000s) Under 25.0- 50.0 75.0-100 or 74.9 1389 4917 6850 5027 2637 2668 2807 5258 4678 3250 4074 885 2094 2848 258 5379 1274 13106 18490 15216 10248 16676 Total 9961 22099 20067 13787 7822 73736 Educational Level 25 4207 3459 49.9 99.9 more Not H.S. graduate H.S. graduate Some college Bachelor's degree Beyond bach. deg. Total 539 367 290 829 1241 4188