The weighted harmonic mean is appropriate for averaging:
A. Ratios where the denominators are the weights
B. Speeds when distances traveled at each speed are equal
C. Prices when quantities purchased are the weights
D. Test scores with equal importance
Answer: Option A
Solution (By JKSSB Mock Tests)
Weighted harmonic mean = Σw / Σ(w/x), ideal for averaging rates or ratios (e.g., price per unit) when the weights correspond to the denominators (e.g., quantities), ensuring correct aggregation.
Explanation:
Stage three of demographic transition features falling fertility due to urbanization, education, and contraception, while mortality remains low, leading to slowing population growth.
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