In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.
A.
0.14s
B.
0.43s
C.
2.32s
D.
2.40s
E.
6.97s
Correct Answer: Option C
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