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
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