Ch 4 · Measures of Central Tendency & Dispersion

5 concept points · 6 formulas · 4 exam-critical points.

🧮 Formula sheet

1. Arithmetic Mean = Σx / n
2. Median (grouped) = L + [(n/2 − cf)/f] × h
3. SD = √[Σ(x − x̄)² / n]
4. Variance = SD²
5. Coefficient of Variation = (SD / Mean) × 100
6. GM = (x₁ · x₂ · ... · xₙ)^(1/n)