Question

Over the last 50 years the population has doubled. Today the world population is 7 billion people. What is the average rate of change of the worlds population?

Answer 1

• 70000000 (70 million people per year)

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Average rate of change for this case is:

• r = difference in the population / time range
• r = (7 000000000 - 3 500000000)/50 = 70000000