Time for 20 oscillations of a pendulum i...

Time for 20 oscillations of a pendulum is measured as `t_1 = 39.6 s , t_2 = 39.9 s , t_3 = 39.5.` What is the precision in the measurements ? What is the accuracy of the measurement ?

`+- 0.2s`

`+- 0.3s`

`+- 0.5 s`

`+- 0.4 s`

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