Two students (X and Y) measured the diameter of a gold coin four times. The results were recorded in the table below. The actual diameter
of the coin is 28.0 mm.
a) Which student (x or Y) had measurements that are precise but not
accurate?
b) Which student (X or Y) had measurements precise and accurate?

Explanation:

To solve this problem, we need to understand the concept of precision and accuracy.

Through this understanding we apply to solve this problem.

For example; if the true value is 28.0mm and the following readings were made:

        A  =  24.0mm, 24.0mm, 24.3mm, 23.9mm  This is a precise measurement but not accurate.

      B  =  27.9mm, 28.0mm, 28.1mm:  This is an accurate measurement because it is close to the true value.

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