As a Summer Intern at the National Institute of Standards $\degree$

question 37

Multiple Choice

As a summer intern at the National Institute of Standards and Technology, a student performed three measurements to determine the density of water at 25 $\degree$ C to four significant figures. She obtained the following results. The known density of water at 25 $\degree$ C to three significant figures is 0.958 g/mL. $$\begin{array} { c c } \text { Trial } & \text { Density } ( \mathrm { g } / \mathrm { mL } ) \\1 & 0.9345 \\2 & 0.9523 \\3 & 0.9107\end{array}$$ The measurements were __________

• A) sufficiently precise but not accurate.
• B) sufficiently accurate but not precise.
• C) both sufficiently precise and accurate.
• D) neither sufficiently precise nor accurate.
• E) not repeated an adequate number of times.

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