Find the mean deviation of 6, 7, 8, 9, 10

  • A 1.2
  • B 1.5
  • C 2
  • D 8
waec 2004mathematics

The correct answer is A. 1.2

\(\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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