Question

{1, 4, 5, 7, 8} - Find the value of mean deviation.

• A. 2
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is A 2

$MeanDeviation=\frac{1}{n}[\sum |x-\overline{x}|]$

$\overline{x}=\frac{1+4+5+7+8}{5}=5.\therefore \text{Mean Deviation}=\frac{1}{5}[|1-5|+|4-5|+|5-5|+|7-5|+|8-5|]]$
= $\frac{1}{5}[4+1+0+2+3]$
= $\frac{10}{5}$
= 2