Three students $S_{1}, S_{2}$ and $S_{3}$ perform an experiment for determining the acceleration due

Question

Three students $S_{1}, S_{2}$ and $S_{3}$ perform an experiment for determining the acceleration due to gravity $(g)$ 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 $=0.1 \mathrm{~cm}$, 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. ________ .\

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(1)\