The smallest possible burette reading is 0.10 and the uncertainty of a burette's reading is half of its smallest value (0.05).
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Relative dispersion = coefficient of variation = (9000/45000)(100) = 20.
The relative standard deviation is the absolute value of the ration of the sample mean to the sample standard deviation. This value appears to be quite small; however, without comparative data it is difficult to know what to make of it. In some contexts it might even be considered large.
That is a statement of a fixed length. There is no uncertainty about that.
Use %RSD when comparing the deviation for popolations with different means. Use SD to compare data with the same mean.
to ensure your experiment is precise and to prevent error to happen during experiment