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According to​ Zipf's Law, the number of cities N with a population greater than S is...

According to​ Zipf's Law, the number of cities N with a population greater than S is inversely proportional to S. In​ 2008, there were 53 U.S. cities with a population greater than 350,000. Estimate ​(a​) the number of U.S. cities with a population between 350,000 and 450,000​; ​(b​) between 300,000 and 650,000.

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