waec model questions vol1 2023 mathematics
Objective • Question 13
Question 13
WAEC_MODEL_QUESTIONS_VOL1
•
2023
The scores of 120 students in a Mathematics test are grouped as follows:
- 0-29 : 15 students
- 30-39 : 15 students
- 40-49 : 43 students
- 50-59 : 27 students
- 60-69 : 0 students
- 70-100 : 20 students
The mean score of the whole class is 48.5. The teacher wishes to raise the overall mean to 52 by awarding the same extra marks to every student who scored in the 0-29 group only. How many extra marks must each of those 15 students receive?
Answer Options
A.
24
Correct Answer
B.
28
C.
30
D.
34
Correct Answer
B
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