Question on: JAMB Physics - 1991

A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is

A
0.14s
B
0.43s
C
2.32s
D
6.97s
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Correct Option: C

Total time = (3 x 60) + 29

= 209sec

period (\frac{t}{n}) = (\frac{209}{90})

= 2.32sec

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