Simulation results using our method with mock FRB samples. Top panel: PDF of H₀ × f_IGM derived by using the 100 mock FRBs and our method with scattering (blue curve). The vertical dashed blue lines correspond to 84.2 and 15.8 percentiles (±σ) of the PDF. Bottom panel: PDF of H₀ by changing the scale from H₀ × f_IGM (top panel) to H₀. To generate the mock data, we assumed H₀ = 68.0 km s⁻¹ Mpc⁻¹, which is shown by the solid vertical black line. The vertical dashed blue lines are the positive and negative standard deviations of H₀ after taking the f_IGM error into account, where the f_IGM error is ±0.05 (Cordes et al. 2022).