Question

Mary and Tommy are measuring 10 grams of sugar on an electronic balance that measures to the hundredths of a gram. Tommy records his sugar as 10 grams and Mary records her sugar as 10.00 grams. Mary's recording of the data is
A) the same as Tommy's.
B) greater than Tommy's.
C) more precise than Tommy's
D) more accurate than Tommy's.

Answer 1

Answer: The correct answer is Option C.

Explanation:

Precision refers to the closeness of two or more measurements to each other.

For Example: If you weigh a given substance five times and you get 3.2 kg each time. Then the measurement is very precise.  

Accuracy refers to the closeness of a measured value to a standard or known value.

For Example: If the mass of a substance is 32 kg and one person weighed 31 kg and another person weighed 29 kg. Then, the weight measured by first person is more accurate.

According to the question:

Mass weighed by Mary = 10.00 g

Mass weighed by Tommy = 10 g

As, mass weighed by Mary is reported upto 2 decimal places. Thus, it is more precise.

Hence, the correct answer is Option C.