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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 :
A
92 $$ \pm $$ 1.8 s
B
92 $$ \pm $$ 3 s
C
92 $$ \pm $$ 2 s
D
92 $$ \pm $$ 5.0 s
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