Can someone explain this to me?
The period of oscillation of the
simple pendulum is (2.62 ± 0.11) s i. e. it lies
between (2.62 + 0.11) s and (2.62 – 0.11) s or
between 2.73 s and 2.51 s. As the arithmetic
mean of all the absolute errors is 0.11 s, there
is already an error in the tenth of a second.
Hence there is no point in giving the period to a
hundredth. A more correct way will be to write
T = 2.6 ± 0.1 s