alleryIn the direct method, Mean = ?
AΣ (fᵢ · xᵢ) / Σ fᵢ
BΣ fᵢ / Σ xᵢ
CΣ (fᵢ + xᵢ) / Σ fᵢ
DΣ xᵢ / Σ fᵢ
Answer & Solution
Correct answer: A. Σ (fᵢ · xᵢ) / Σ fᵢ
Each interval is represented by its class mark xᵢ with frequency fᵢ.
Mean = Σ(fᵢ·xᵢ) / Σfᵢ — the weighted average across the intervals.
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