The bar chart shows the frequency distribution ... - WAEC Mathematics 2012 Question
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 option: c
\(\begin{array}{c|c} x & f & fx\ \hline 1 & 6 & 6 \
2 & 8 & 16\ 3 & 8 & 18\ 4 & 5 & 20\end{array}\)
mean x = \(\frac{\sum fx}{\sum f}\)
= \(\frac{60}{25}\)
x = 2.4
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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