Student A has collected data for the mass of a sample of gold (Au) over five trials. The accepted mass of the Au is 25.56 g. After massing the Au on the scale, Student A recorded the following measurements:
Scale Number | Mass of Au in Grams
1 | 22.53
2 | 22.51
3 | 22.56
4 | 22.54
5 | 22.59
Comment on the accuracy and precision of this data set. Explain your reasoning.
Average mass is 22.55 g, minimal value is 22.51 g and maximal value is 22.59 g. Thus, the result of measurements can be written as m = (22.55 ± 0.05) g.
Accuracy is |25.56 - 22.55| = 3 g, precision of measurements is 0.05 g.