A student measures an average molecular weight of 170.2 g/mol with a standard deviation of 1.7. What is the precision of this measurement?

Answer: The precision of measurement is,

(170.2 ± 1.7) g/mol

Explanation: The precision of a set of measurements shows how the measured values spread around a particular mean.

Mathematically, it is represented as,

Mean ± standard deviation

For this question, it is

(170.2 ± 1.7) g/mol

QED!