Three students S 1 ,   S 2 and S 3 perform an experiment for determining the acceleration due to…

Three students $S_1,{\mathit{ }\mathit{S}}_2$ and $S_3$ perform an experiment for determining the acceleration due to gravity $\left(g\right)$ using a simple pendulum. They use different lengths of pendulum and record time for different number of oscillations. The observations are as shown in the table.

(Least count of length $=0.1 \mathrm{m}$, least count for time $=0.1 \mathrm{s}$)

If $E_1, E_2$ and $E_3$ are the percentage errors in $g$ for students $1, 2$ and $3$, respectively, then the minimum percentage error is obtained by student no $\underline{ }$ $.$