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

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(1) 92±2 s. Readings: 90, 91, 95, 92 s. Mean: (368)/4=92 s. Deviations: 2, 1, 3, 0 s. Mean absolute deviation: 6/4=1.5 s. The clock reads to 1 s, so the uncertainty is rounded to that precision: 2 s. Reported: 92±2 s.

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

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