बुद्धि लब्धि निकालने का सूत्र है:

उत्तर: (A) MA/CA × 100 — IQ = Mental Age (MA) / Chronological Age (CA) × 100. This formula was given by William Stern. For example, if MA=12 and CA=10, IQ = 12/10 × 100 = 120 (above average).