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## Homework Statement

This is from a laboratory exercise. I was asked to measure the time it took for a pendulum to cover 3 periods. I repeated this 25 times, to get 25 measurements for as many trials. I also calculated the standard deviation from the measured data (calculated for different question).

The question I am stuck on, is however, the one that concerns finding the uncertainty in the overall average of the pendulum data. Any help is appreciated.

## Homework Equations

I am given this equation for finding the average uncertainty.

[tex]\sigma[/tex]

_{average}= [tex]\sigma[/tex]

_{individual}/ square root of n

n being number of trials.

## The Attempt at a Solution

So, the equations asks for the uncertainties of individual measurements. Can I somehow calculate the individual uncertainties from the standard deviation or the average?

Thanks a lot.