Two sections of Class IX were measured for their heights (in cm).
Section A: 145, 150, 148, 152, 147, 149, 151, 143, 146, 154
Section B: 142, 155, 149, 158, 153, 150, 145, 159, 147, 148
(a) Find the range of heights for Section A.
(b) Find the range of heights for Section B.
(c) Which section shows greater spread in height and by how many centimetres?
(d) Suppose the shortest student in Section B grows by 4 cm before the next measurement. Recalculate the range for Section B and state how it changes.