Question

Later, another student finds that 100 complete swings take 92.8 seconds. From these measurements, what is the period of the pendulum?​

Answer 1

As per my knowledge,
100/2= 50( for complete pendulum)
92.8/50=1.856second

Answer 2

If another student found = 100

Swings took = 92.8 s

then he or she can pretend that all the swings are identical (which is tacitly untrue!) and claim that the period is:

92.8 a/100 swings

≈0.9 s/swing

which is of course an estimate, because by the 50th swing you should imagine the pendulum to have significantly slowed down (thus rendering each period not identical to the previous and the first 50 swings to be more accurate than the latter 50).

No standard deviation can be recorded from such data, so to be practical, the student should redo the experiment completely, and do only 10 swings maximum, recording the period each time.