Marks
1
2
3
4
5
Frequency
2
2
8
4
4
The table above show the marks obtained in a given test.
Find the mean mark
A
3.1
B
3.0
C
3.2
D
3.3
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Mark(χ)
f
fχ
1
2
2
2
2
4
3
8
24
4
4
16
5
4
20
∑f = 20
∑fχ = 66
\(Mean = \frac{\sum fx}{\sum f}\)
= \(\frac{66}{20}\)
= 3.3
Source: Myschool Past Questions Archive (Record #10347)