# Populations math

 Дата канвертавання 19.04.2016 Памер 6.09 Kb.
 POPULATIONS MATH Answers on page 2 1,270 deer are living on an island that is 830 square kilometers in size. What is the population density of the deer per square kilometer? A city with 53,340 people has 876 births. What is the birth rate? Another city experiences 12 deaths for each thousand people. What is the death rate? A village of 23,473 people have 2,342 births and 473 deaths. What is the growth rate for this village? A small country of 744,785 people have 44,678 immigrants and 12,567 emigrants. They also experience 15,898 deaths and 35,665 births. What is the growth rate of this small country? Would you be likely to find this country in Africa or Europe? How many years will it take for this country to double its population? If a country were doubling its population every 35 years, what would its growth rate be? If a city of 3,400 people was growing at a rate of 3%, what would its population be in 25 years? 1,270 deer are living on an island that is 830 square kilometers in size. What is the population density of the deer per square kilometer? 1,270/830 = 1.53 deer/sq. km A city with 53,340 people has 876 births. What is the birth rate? (876/53,340)(100) = 1.64 births per 1000 women Another city experiences 12 deaths for each thousand people. What is the death rate? 12 deaths per 1000 people A village of 23,473 people have 2,342 births and 473 deaths. What is the growth rate for this village? 2,342 – 473 = 1,869 Growth Rate = (difference/original)(100) = (1,869/23,473)(100) = 7.96% OR Growth Rate = (crude birth – crude death)/10 A small country of 744,785 people have 44,678 immigrants and 12,567 emigrants. They also experience 15,898 deaths and 35,665 births. What is the growth rate of this small country? (44,678 + 35,665) – (12,567 + 15,898) = 51,878 (51,878/744,785)(100) = 7.0% Would you be likely to find this country in Africa or Europe? How many years will it take for this country to double its population? Rule of 70. 70/7 = 10 years If a country were doubling its population every 35 years, what would its growth rate be? 70/35 = 2% If a city of 3,400 people was growing at a rate of 3%, what would its population be in 25 years? Future Pop. = Noe(rt) = 3400e((.03*25)) =7,197.8

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