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What are the likely maximum and minimum values for this measurement 20.4+_0.1cm
The more precise your instruments of measurement are, the less percentage of error you will have.
A variable is a measurement that can take different "values". I put values in quotation marks because a variable can take qualitative values (for example, colour of eye) as well as quantitative (numerical) ones.
Accuracy. How close you are to your expected value. Precision. How close together you values are.
For a set of measurements, the mean valueis the sum of all the measurement values divided by the number of measurements in the set.