Help needed with the following question

Thank you in advance!

3. A student measures a distance x many times to find that XAvg=32 cm and that the standard deviation Ox is 2 cm. Assuming the measurements follow a normal error distribution, what percentage of the data might the student expect to find falling in the following range: (show work/explain reasoning). a) between 32 cm and 34 cm? b) between 29 cm and 33 cm? c) greater than 35