6.72 The cumulative proportions of age groups of U.S. residents are shown in table below for years 1900 and 2000.

a Construct a Q–Q plot for each year. Use these plots as a basis for discussing key differences between the two age distributions.
b Each of the Q–Q plots should show some departures from normality. Explain the nature of these departures.

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Cumulative Proportion Age 1900 2000 5 0.121 0.068 15 0.344 0.214 25 0.540 0.353 35 0.700 0.495 45 0.822 0.576 55 0.906 0.709 65 0.959 0.795