A group of 20 people are shipwrecked on an island and colonize it. During their

Question

A group of 20 people are shipwrecked on an island and colonize it. During their first five years, one of the original colonists dies, eight new babies are born, and, sadly, two of those babies die soon after birth.

What are the average crude birth rate (births per 1000 people per year) and the crude death rate (deaths per 1000 people per year) during that five-year period?

What is the population growth rate, expressed as a percent?

If the population continues growing exponentially at the rate you calculated in part b, how many people will be living on the island after 50 years?

Briefly describe two different factors that could cause the population growth rate to change over time and what effect each would have.

Explanation / Answer

crude birth rate = 8/20*1000 = 400

crude death rate = 3/28*1000=107.14

population growth rate in% = crude birth rate%-crude death rate%=29.3%

after 50 years the population will be 10 times that of after 5 years = 25*10 = 250

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