The following data give the age distribution of U.S. citizens as a function of age group. Select a method for graphing the results. Interpret the results. Then combine the values into three meaningful groups and provide a graphical analysis of the distribution. How do the two analyses differ in their information content and emphasis?

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Age group Percentage 5-9 10-14 15-19 20-24 25-29 30-34 7.1 7.4 8.1 9.3 9.4 8.6 7.8 Age group Percentage 35-39 40-44 45-49 50-54 55-59 60-64 >65 6.2 5.2 4.9 5.2 5.1 4.5 11.2