I am taking the following example:
Lengths of an object are measured as : 5cm , 5.2cm , 5.1cm , 5.5 cm. Calculate the true value and the error .
The answer is True value = 5.2 cm error = 0.15 cm.
I am unable to interpret the answer. I have the following two explanations.
If the length of the object is measured again , it is likely to lie between 5.2 +- 0.15 cm i.e. between 5.05 cm and 5.35 cm.
The "actual length " of the object is somewhere between 5.05 cm and 5.35 cm.
I also cannot understand whether the error of 0.15 is the same as the uncertainty.
I don't know which of the explanations is correct or there is some other correct explanation.
Please provide me the correct explanation.