Answer:
C. Group A
Explanation:
First, let's define accuracy and precision.
Precision: the measurements are all close to each other
Accuracy: the measurements are close to the true value.
Let's examine the answer choices.
A. Group C: 32.1 g, 35.0 g, 25.0 g
This is not accurate or precise. The measurements are far from each other and only one is close to 25 g.
B. Group D: 20.0 g, 25.0 g, 30.0 g,
The measurements are relatively accurate and precise. They are within 5.0 grams of each other and the true value.
C. Group A: 28.5 g, 28.4 g, 28.5
The measurements are the most precise. They are all within 0.1 gram of each other. They are also somewhat accurate.
D. Group B: 25.5 g, 25.0 g, 24.8 g
The measurements are not precise or accurate. There is one measurement that is far from the true value and the other measurements.
Therefore, the most precise measurements are from Group A.
