Score
1
2
3
4
5
6
7
8
9
Frequency
2
3
6
7
9
6
2
2
3
The table above shows the scores of a group of 40 students in a physics test
What is the mean of the distribution?
A
4.2
B
4.5
C
4.8
D
5.0
E
5.2
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
x
1
2
3
4
5
6
7
8
9
Total
f
2
3
6
7
9
6
2
2
3
40
fx
2
6
18
28
45
36
14
16
27
192
Mean = \(\frac{\sum fx}{\sum f}\)
= \(\frac{192}{40}\)
= 4.8
Source: WAEC / JAMB / NECO Classroom Archive (Record #23225)