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A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. ...

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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