Population Pyramids https://www.youtube.com/watch?v=RLmKfXwWQtE (5:01) ‘Population pyramids: Powerful predictors of the future - Kim Preshoff’

Class mini-census (survey of the population) How many people live in your household? Add up the total & divide by the number surveyed Average Canadian household has 2.5 people Average Mexican household has 3.8 people Average American household has 2.6 people

Class mini-census 2. What is the average age of each person in your household? Find the median age by writing out all of the ages from highest to lowest & locating the middle number Median age of Canadians is 39.8 years old Median age of Mexicans is 27.3 years old Median age of the United States is 36.8 years old

Class mini-census 3. How many people in your household were born outside of Mexico? Add up the answers, divide by the number surveyed & multiply by 100 to get the percentage Percentage of Canadians born outside of Canada is 20.6% Percentage of Americans born outside the USA is 13.7% Mexico no se?

Interpreting POPULATION PYRAMIDS What you should understand: the characteristics of the 4 types of population pyramids

Population Pyramids Population pyramids show the age/sex structure of a country Tells you what % of the population is a certain age and gender Groups put into 5 year categories (cohort)

RAPIDLY EXPANDING Very high birth rate Population growing very fast (3-4% per year) Low income countries

EXPANDING High birth rate Population growing (1-2% per year) Middle to low income countries

STATIONARY Births replace deaths Population not changing much at all High income countries

DECLINING More deaths than births Population shrinking Potential social problems

Task Time for you to construct some population pyramids