Chapter 13

• Direct Mean(x) = (∑f_ix_i) / (∑f_i)
• Assumed Mean(x) = a+ (∑f_id_i) / (∑f_i) (where d_i = x_i – a)
• Mode = l+[ (f₁ – f₀) / (2f₁ – f₀ – f₂)] x h
• Median = l + [(n/2 – cf) / f] x h
• Empirical Relationship = Mode = 3(Median) – 2(Mean)