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Alright here's an example. I'll be using the ranges specified in the ms to prove that your uncertainty must be between 0.2<_<0.5If we have to only estimate then we dont include least count?
Let's say our times were: 6.72, 7.41, 8.23, 9.16, 7.34
First find the mean value.
That is 6.72, 7.41, 8.23, 9.16, 7.34 / 5 ======> 7.772
Now find the absolute uncertainty using ( Max - Min / No. of Readings ):
(9.16-6.72) / 5 = 0.488 s
0.488 s = well within the range of 0.2 <---> 0.5
Percentage uncertainty ---> 0.488/7.772 * 100 = 6.3 %
Hope that helped