Social & Preventive Medicine Definition & Concepts 9ce354ad If TFR in a population is 4, then GRR would be (approx.) A 2 B 4 C 8 D 16 High-Yield Explanation - GRR or NRR= 1/2 TFR (approx.) - In given question, TFR is 4; hence GRR is half of 4 = 2