Students I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and / or record time for different number of oscillations. The observations are shown in the table.

Least count for length = 0.1 cm

Least count for time = 0.1s

If `E_I, E_II` and `E_III` are the percentage  errors in g, i.e., `((Deltag)/g xx 100)` for students I, II and III, respectively,