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 :
(1) 92±2 s
(2) 92±5.0 s
(3) 92±1.8 s
(4) 92±3 s
