The average number of people living on each square mile of the county is 17 the option second is correct.
What is population density?
It is defined as the ratio of the population to the total area. The population density represents the average number of people living on each square unit.
Total area of the rectangular region = 50×60 = 3000 square miles
Total population = 50,000
The population density = 50,000/3000
= 16.667 ≈ 17 people per square unit
Thus, the average number of people living on each square mile of the county is 17 the option second is correct.
Learn more about the population density here:
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