Question

From 1950 to 1985, the population of Country X increased by approximately how many million people?

• A. 45
• B. 80
• C. 165
• D. 200
• E. It cannot be determined from the information given.

Hint:

This is a multi-step data problem. Break it down into smaller, manageable parts: find the first population, find the second population, then find the difference. Writing down each step helps to avoid errors.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The graph does not directly show the total population. To find it, we must combine the two pieces of information that are given: the number of cars and the population per car.
Step 2: Key Formula or Approach:
The relationship is: \[ \text{Total Population} = (\text{Number of Registered Cars}) \times (\text{Population per Registered Car}) \] We will apply this formula to find the population in 1950 and 1985, and then calculate the difference.
Step 3: Detailed Explanation:
Population in 1950: - Registered Cars (solid line): \(\approx\) 10 million. - Population per Car (dashed line): Labeled as 13.2. - Total Population (1950) \(\approx\) 10 million \(\times\) 13.2 = 132 million. Population in 1985: - Registered Cars (solid line): Labeled as 43.1 million. - Population per Car (dashed line): Approximately 4.9 (estimated from the graph). - Total Population (1985) \(\approx\) 43.1 million \(\times\) 4.9 \(\approx\) 211.2 million. Population Increase: - Increase = Population in 1985 - Population in 1950 - Increase \(\approx\) 211.2 million - 132 million = 79.2 million. This result is closest to 80 million.
Step 4: Final Answer:
The approximate population increase from 1950 to 1985 is 79.2 million people, which is rounded to 80 million.