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A student measures the time period of 100 oscillations

Question:

A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is $90 \mathrm{~s}, 91 \mathrm{~s}, 95 \mathrm{~s}$ and $92 \mathrm{~s}$. If the minimum division in the measuring clock is $1 \mathrm{~s}$, then the reported mean time should be :-

1. $92 \pm 3 \mathrm{~s}$

2. $92 \pm 2 \mathrm{~s}$

3. $92 \pm 5.0 \mathrm{~s}$

4. $92 \pm 1.8 \mathrm{~s}$

Correct Option: , 2

Solution: