Two different batches of saplings were measured for their heights (in centimetres):
Batch A : 12, 15, 14, 13, 12, 15
Batch B : 9, 19, 11, 16, 14, 10
(i) Calculate the range for Batch A.
(ii) Calculate the range for Batch B.
(iii) On the basis of the values obtained in parts (i) and (ii), explain which batch shows greater variability in height.
(iv) Briefly state one limitation of using only the range to compare the variability of the two batches.