Question

if the known mass of an object is 2.5 grams, which of the following measurements is most accurate? measurements: 2.49 g (teal), 0.26 g (orange), 4.29 g (purple), 2.75 g (yellow)

Explanation:

Step1: Calculate absolute error for 2.49 g

Absolute error = $|2.49 - 2.5| = 0.01$ g

Step2: Calculate absolute error for 0.26 g

Absolute error = $|0.26 - 2.5| = 2.24$ g

Step3: Calculate absolute error for 4.29 g

Absolute error = $|4.29 - 2.5| = 1.79$ g

Step4: Calculate absolute error for 2.75 g

Absolute error = $|2.75 - 2.5| = 0.25$ g

Step5: Compare absolute errors

0.01 g (for 2.49 g) is the smallest among 0.01, 2.24, 1.79, 0.25. Smaller absolute error means more accurate measurement.

Answer:

2.49 g