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In 1940, the Population Density of Philadelphia Was Given by 60

Question 151

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In 1940, the population density of Philadelphia was given by 60 e−0.4e ^ { - 0.4 } thousand people per square mile at a distance t miles from City Hall. How many people lived between 1 and 3 miles from City Hall?
Enter just an integer (no words) representing the number to the nearest thousand.

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