The bar chart shows the frequency distribution of marks scored by students in a class...
MATHEMATICS
WAEC 2012
The bar chart shows the frequency distribution of marks scored by students in a class test. Calculate the mean of the distribution.
- A. 6.0
- B. 3.0
- C. 2.4
- D. 1.8
Correct Answer: C. 2.4
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
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