In an investigation on accuracy and precision, Myriah measures the mass of a 10.00 g piece of metal several times. Her measurements are 9.98 g, 10.02 g, 10.01 g, and 9.99 g. Which statement best describes her results?
Answer
A
They are accurate but not precise.
B
They are both precise and accurate.
C
They are neither accurate nor precise.
D
They are precise but not accurate.
Explanation
The measurements are very close to one another, so they are precise. Their average is (9.98 + 10.02 + 10.01 + 9.99) ÷ 4 = 10.00 g, matching the accepted mass, so they are accurate too. The best description is that they are both precise and accurate.
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