Interpret Population Density Across Areas

5 questions0m 0s

Learn the skill

Population density is population divided by area. Combine populations and areas before finding a combined density; do not average unequal-area districts' densities without weighting. A regional average does not describe every neighborhood.

Worked example

Districts with 100 people over 1 square km and 900 over 9 square km together have 1,000/10 = 100 people per square km. Always keep the population and area boundaries consistent.

Invented District Data

North District has 12,000 residents and area 20 square km. South District has 18,000 residents and area 60 square km. The districts do not overlap and together make up the whole study region. No neighborhood-level data is provided.

1. What is North District's density, in residents per square km? Answer

2. What is South District's density, in residents per square km? Answer

3. What is the combined region's density, in residents per square km? Answer

4. Why is the simple average of 600 and 300 not the combined density? Density cannot use division Both populations are identical The districts have unequal areas

5. Can these averages establish the density of every neighborhood in North District? No, neighborhood densities may vary within the district Yes, every neighborhood must equal 600 Yes, boundaries eliminate variation