3. Three students make measurements (in m) of the length of a rod using a meter stick. Each student's measurements are tabulated in the table below. Using your calculator in statistic mode calculate the mean L, standard deviation S and uncertainty u of the measurements. Student L₁ Student 1 1.4717 Student 2 1.4753 Student 3 1.4719 L₂ 1.4711 1.4759 1.4723 L3 1.4722 1.4756 1.4705 L4 1.4715 1.4749 1.4719 ī 1.4716 1.4754 11.4716 SD 0.000397 ±0.000.397 0.000370 ± 0.000370 10.000685 £0.000685 u Note that the actual length of the rod is determined by a laser measurement technique to be 1.4715 m (this should be considered the standard value). a) State how one determines the accuracy of a measurement. Apply your idea to the measurements of the three students above and state which student has the most accurate measurement.

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Estimate of calculation