Question

Three students were asked to weigh 3.5 g of NaCl. The recorded readings were 3.4 g, 3.6 g, and 3.3 g. How can these readings best be interpreted? a.not accurate and not precise b.not accurate but precise c.accurate and precise d.accurate but not precise

Answer 1

Answer:

By the end of this section, you will be able to:

Define accuracy and precision

Distinguish exact and uncertain numbers

Correctly represent uncertainty in quantities using significant figures

Apply proper rounding rules to computed quantities

Explanation:

Answer 2

Answer:

c.accurate and precise

These readings can be considered accurate because they were close to the given weight to be taken which was 3.5 and they were precise because the readings were close to each other.  Accuracy refers to how close a measurement is to the true or accepted value. Precision refers to how close measurements of the same item are to each other. Precision is independent of accuracy. That means it is possible to be very precise but not very accurate, and it is also possible to be accurate without being precise.