D. Fertile land, water availability, and economic opportunities
Answer: Option D
Solution (By JKSSB Mock Tests)
Population density correlates with habitability factors: fertile soil, water, moderate climate, and jobs attract settlement, leading to high density in river valleys, coasts, and urban centers.
Explanation:
Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂) weights each group's mean by its size, providing the correct overall mean when aggregating subgroup statistics.
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