Question

The correct mass of a block is 28.0 grams. A chemist measures the block

4 times and records the following measurements: 42.0 grams; 41.8 grams;
42.1 grams; and 41.9 grams. Identify the accuracy and precision of the
chemist's measurements.
O NOT accurate, but precise
O Neither- NOT accurate and NOT precise
O Both accurate AND precise
O Accurate, but NOT precise

Answer 1

Answer: NOT accurate, but precise.

[translation: You screwed up, but did it in style].

Step-by-step explanation:

The average mass measurement is 41.95g. Compared to the actual value of 28.0 grams, the measurement is NOT accurate.

The standard deviation for the data is 0.112. Dependiong on your definition of precision, this looks relatively good. I would go for precise.