Percentages: The most useful statistics ever invented

For example, if in the year 2010 there were to be six million births in the United States “out of” a population of 300 million, the (“crude”) birth rate would be 6/300, or 2%, or 20 per thousand. If there were to be three million deaths in that same year, the (also “crude”) death rate would be 3/300, or 1%, or 10 per thousand ... ................
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