waec model questions vol1 2023 mathematics
Objective • Question 7
Question 7
WAEC_MODEL_QUESTIONS_VOL1
•
2023
In a class of 30 students the distribution of test scores (in whole numbers) is partially given below.
Score: 40 45 50 55 60 65 70 75 80
Frequency: 2 a 4 b 5 3 c 2 4
The mean score is 58 and the median score is 60.
(i) Find the value of a + b + c.
(ii) What is the probability that a randomly selected student scored at least 70?
Answer Options
A.
7; 3/14
Correct Answer
B.
8; 4/15
C.
6; 2/13
D.
9; 5/16
Correct Answer
B
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