The bar chart shows the frequency distribution of marks scored by students in a class test. Calculate the mean of the distribution.
- 6.0
- 3.0
-
2.4
- 1.8
The correct answer is: C
Explanation
\(\begin{array}{c|c} x & f & fx\\ \hline 1 & 6 & 6 \\2 & 8 & 16\\ 3 & 8 & 18\\ 4 & 5 & 20\end{array}\)
mean x = \(\frac{\sum fx}{\sum f}\)
= \(\frac{60}{25}\)
x = 2.4