Answer
(a) 2.50, 2.55, 2.59, 2.60: not precise as they differ a lot.
(b) 2.53, 2.54, 2.54, 2.55: accurate and precise because all values are very close to the true mass
(c) 2.49, 2.51, 2.53, 2.63: These are not precise as the values differ a lot, but they are accurate because their average is approximately the actual mass.
(d) 2.44, 2.44, 2.45, 2.47: This is not accurate as it is far from the actual value, but it is precise since the values are consistent.
Work Step by Step
(a) 2.50, 2.55, 2.59, 2.60: not precise as they differ a lot.
(b) 2.53, 2.54, 2.54, 2.55: accurate and precise because all values are very close to the true mass
(c) 2.49, 2.51, 2.53, 2.63: These are not precise as the values differ a lot, but they are accurate because their average is approximately the actual mass.
(d) 2.44, 2.44, 2.45, 2.47: This is not accurate as it is far from the actual value, but it is precise since the values are consistent.
