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

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

A. 0.14s
B. 0.43
C. 2.35
D. 6.97s





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