Find the mean deviation of 6, 7, 8, 9, 10
MATHEMATICS
WAEC 2004
Find the mean deviation of 6, 7, 8, 9, 10
- A. 1.2
- B. 1.5
- C. 2
- D. 8
Correct Answer: A. 1.2
Explanation
\(\begin{matrix}
x & x-m & |x-m| \\
6 & -2 & 2 \\
7 & -1 & 1 \\
8 & 0 & 0 \\
9 & 1 & 1 \\
10 & 2 & 2 \\
& & 6
\end{matrix}
\)
Mean deviation\(=\frac{\sum|x-m|}{n}=\frac{6}{5} = 1.2\)
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