By using Scherrer's equation, I found the individual crystalline size of prepared samples calculated for corresponding peak position from the XRD pattern and taken averages for each sample.

e.g: 1. 36.33 nm (or)

2. 36.33 ± 2.00 nm (or)

3. 36 nm

which one correct for representing Crystallite size?

Are speaking the above numbers correct when speak about accuracy?

or some say numbers should be rounded off in accordance with the accuracy.

why would so?