The marks obtained out of 100 by 48 students of Class X in a Mathematics test are grouped below.
Class interval: 0–20 | 20–40 | 40–60 | 60–80 | 80–100
Frequency: 5 | 9 | 17 | 12 | 5
Using the table, answer the questions that follow.
(i) Calculate the total number of students represented by the distribution and verify that it matches the stated total of 48.
(ii) Determine the class mark (mid-point) of each class interval and list them in a separate column.
(iii) Identify the modal class and state its frequency.