1) Three students named Abe, Barb, and Cal make measurements (in m) of the length of a table. Lengths, means, σ, a are tabulated in the table below: Student Li L2 L3 L4 L σn-1 α Abe 1.4717 1.4711 1.4722 1.4715 Barb 1.4753 1.4759 1.4756 1.4749 Cal 1.4719 1.4727 1.4723 1.4705 Calculate the mean, standard deviation from the mean, and standard error for each student's measurements. Keep only one significant figure in the standard error a, and this determines the r of significant figures in the mean. The actual length of the table is 1.4715 m. a) Which student is the most accurate? Why? b) Which student is the most precise? Why? c) Which student has a systematic error in his/her measurements? Why? from a given radioactive sample were taken. T