The marks obtained by 40 students in a Mathematics test out of 100 are listed below:
13, 18, 27, 32, 35, 38, 42, 45, 49, 53,
55, 57, 61, 63, 65, 67, 68, 70, 71, 72,
73, 74, 75, 76, 77, 78, 79, 80, 82, 84,
85, 86, 87, 88, 89, 90, 92, 94, 96, 98
(i) Prepare a grouped frequency distribution table using a class width of 10, starting the first class from 0–9.
(ii) Calculate the class mark (mid-point) for each class formed in part (i).
(iii) On graph paper, draw a histogram to represent the distribution. (Use a suitable scale.)