The marks obtained by two sections, A and B, of Class XI in a mathematics unit test are given below:
Section A: 48, 55, 52, 50, 45, 49, 51, 56
Section B: 62, 40, 58, 44, 46, 59, 61, 50
Answer the following.
(i) Find the range for each section.
(ii) Calculate the standard deviation of marks for each section (correct to two decimal places).
(iii) Which section shows more consistent performance? Justify your answer with the calculations obtained in (i) and (ii).