Question

The length of a straight line is measured a number of times by a number of observers. The following are the results
of these measurements. Decide precision and accuracy. Actual length = 3.785 cm ± 0.001 cm Ist set of measurements 3.8 Cm, 3.9 cm, 3.7 cm
2nd set of measurements 3.478 cm, 3.479 cm, 3.478 cm, 3.478 cm, 3.479 cm
3rd set of measurements 3.55 cm, 3.65cm, 3.45 cm, 3.35 cm
4th set of measurements 3.784 cm, 3.785 cm, 3.784 cm, 3.785 cm, 3.784 cm​

Answer 1

Answer :

Frist set of measurements are accurate because it is close to the actual value and it is not precise.

Second set of measurements are not accurate and it is most precise because the readings are reproducible.

Third set of measurements are neither accurate nor precise.

Fourth set of measurements are accurate as well as precise${.}$

The accuracy of a measurement is a measure of how close the measured value is to the true value of the quantity. Precision tells us to what resolution or limit the quantity is measured.

Answer 2

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• Frist set of measurements are accurate because it is close to the actual value and it is not precises. Second set of measurements are not accurate and it is most precise because the readings are reproducible. Third set of measurements are neither accurate nor precise. Fourth set of measurements are accurate as well as precise. The accuracy of a measurement is a measure of how close the measured value is to the true value of the quantity. Precision tells us to what resolution or limit the quantity is measured.