Time periods of oscillation of the same simple pendulum measured using four different measuring clocks were recorded as $4.62 \mathrm{~s}, 4.632 \mathrm{~s}, 4.6 \mathrm{~s}$ and $4.64 \mathrm{~s}$. The arithmetic mean of these reading in correct significant figure is.
A$4.623 \mathrm{~s}$
B$4.62 \mathrm{~s}$
C$4.6 \mathrm{~s}$
D$5 \mathrm{~s}$
JEE MAIN 2024, Diffcult
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C$4.6 \mathrm{~s}$
c Sum of number by considering significant digit sum $=4.6+4.6+4.6+4.6=18.4$
$\text { Arithmetic Mean }=\frac{\text { sum }}{4}=\frac{18.4}{4}=4.6$
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