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# Q: What is the proper way to calculate the uncertainty of elapsed time using a manual...

Q: What is the proper way to calculate the uncertainty of elapsed time using a manual stopwatch?

The proper way to calculate the uncertainty of elapsed time using a manual stopwatch is-

First find the range of the elapsed times then make it half.

For example

If shortest time is t1 and largest time is t2 then

Uncertainty in time = (t2 - t1) /2

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