The time measured is 25 seconds. The error in the measurement is 0.2 seconds. The % error is therefore
(0.2/25)x100 = 0.8%.
The period of one oscillation is 25/20=1.25 seconds. The error in the period is 0.8/100 x 1.25 = 0.01 second.
ie period = 1.25 +/- 0.01 s.
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