The marks obtained by pupils of class are grouped as shown below; 0 - 4,...

WAEC 1996

The marks obtained by pupils of class are grouped as shown below; 0 - 4, 5 - 9,10 -14, 15 -19. Which of the following is/are not true? l. 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, 9.5, 14.5 and 19.5

A. I only
B. II only
C. III only
D. I and II only
E. II and III only

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Correct Answer: Option B

Explanation

0 - 4; Mid Values 0 + 4/2 = 2
5 - 9; 5 + 9/2 = 7
10 - 14; 10 + 14/2 = 12
15 - 19; 15 + 19/2 = 17
The class interval is 5 class boundaries are 0.5, 4.5, 9.5, 14.5, 19.5

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