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Time periods of oscillation of the same simple pendulum measured using four different measuring clocks were recorded as 4.62 s, 4.632 s, 4.6 s and 4.64 s. The arithmetic mean of these reading in correct significant figure is.

1. 4.623 s
2. 4.62 s
3. 4.6 s
4. 5 s

Correct answer: 4.6 s

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