Question

1. How much did the population change between 1950 and 1960? What was the average annual change for that period? Hint: Calculate the changes, then calculate the mean, or average, by dividing by the number of years. State the units clearly. The units are listed on the chart.

2. Repeat question 1 for the period between 1970 and 1980; between 1990 and 1995.

3. Do you think a linear model (or graph) would best illustrate this data? Explain your reasoning.

Answer 1

0.484 billion 0.0484 billion per year

Explanation:

Population change between 1950 and 1960 = 3.039 - 2.555 = 0.484 (billion)

Number of years between 1950 and 1960 = 1960 - 1950 = 10 years

Average population change per year = 0.484 ÷ 10 = 0.0484 billion per year