Question

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.

Answer 1

World population increased by 22% in 1960-1970, compared to 20% in 1950-1960, which was twice as much as the 20% registered for the 20 years 1930-1950.

Explanation:

Answer 2

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