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The accuracy in the measurement of time for 20 oscillations of a pendulum for the following measurement

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The accuracy in the measurement of time for 20 oscillations of a pendulum for the following measurement  t1=39.6s , t2=39.9s and t3=39.5 s , is 

A)±0.2s

b)±0.3s

c)±0.5s

d)±0.4s

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correct option is A)±0.2s

 

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