Accuracy Versus Precision Practice
The precision of a set of measurements is given by the range of values (largest value  smallest value) measured. If a set of measurements has a high level of precision, it has a small range of values.
The percent error of a set of measurements tells us how closely the average of a set of measurements agrees with the accepted value of whatever is being measured, and as a result, percent error is a method for calculating the accuracy of a set of measurements. An accurate set of measurements has a small percent error. You can see the percent error formula at the right.

