Question

The table classifies 40 persons who took a test according to the marks they scored: Calculate the mean marks scored.

Marks	Persons
0 - 10	4
10 - 20	6
20 - 30	16
30 - 40	8
40 - 50	6

• A. 24.5
• B. 28.5
• C. 26.5
• D. 30.0

Answer 1

Answer:

C. 26.5

Marks	Persons	class mark	Total marks
0 - 10	4	5	20
10 - 20	6	15	90
20 - 30	16	25	400
30 - 40	8	35	280
40 - 50	6	45	270
Total	40		1060

Mean = total / number

= 1060/40

= 26.5