The marks obtained by pupils of a class grouped as shown below: 0-4; 5-9; 10-14; 15-19.
Which of the following is/are not true?
i. the mid values of the grouped marks are 2,7,12 and 17
ii. The class interval is 4
iii. The class boundaries are 0.5, 4.5, 9, 14.5 and 19.5

• A. i only
• B. ii only
• C. iii only
• D. i and ii only
• E. ii and iii only