The bar chart shows the frequency distribution of marks scored by students in a class test. Calculate the mean of the distribution.
Attached Figure / Diagram
A
6.0
B
3.0
C
2.4
D
1.8
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
\(\begin{array}{c|c} x & f & fx\\ \hline 1 & 6 & 6 \\
2 & 8 & 16\\ 3 & 8 & 18\\ 4 & 5 & 20\end{array}\)
mean x = \(\frac{\sum fx}{\sum f}\)
= \(\frac{60}{25}\)
x = 2.4
Source: Myschool Past Questions Archive (Record #36814)