Below are two histograms. One corresponds to the ages at which a sample of people applied for marriage licenses; the other corresponds to the last digit of a sample of social security numbers. Which graph is which, and why? 
Definitions:
Spending Changes
Refers to fluctuations in the amount of money spent by consumers, businesses, or the government.
Social Security
A government program designed to provide financial assistance to elderly, disabled, and survivors through retirement benefits, disabilities, and other means.
Tax Revenue
The income collected by the government from taxes.
National Debt
The cumulative sum of funds borrowed by a nation's government, usually due to spending more than it earns.
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