Zipf's Law, developed by George Zipf in 1949, states that in a given country, the population of a city is inversely proportional to the city's rank by size in the country.116 Assuming Zipf's Law:

(a)

Write a formula for the population, P, of a city as a function of its rank, R.

(b)

If the constant of proportionality k is 300,000, what is the approximate population of the largest city (rank 1)? The second largest city (rank 2)? The third largest city?

(c)

Answer the questions of part (b) if k = 6 million.

(d)

Interpret the meaning of the constant of proportionality k in this context.

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