Question

The mean deviation of the data $2,9,9,3,6,9,4$ from the mean is

• A. $2.23$
• B. $2.57$
• C. $3.23$
• D. $3.57$

Answer 1

The correct option is B $2.57$

Given data is, 2,9,9,3,6,9,4
Here, $n=7,\overline{x}=\frac{2+9+9+3+6+9+4}{7}=6$
$\therefore$ Mean deviation from mean is $=\frac{1}{n}(\sum |x-\overline{x}|)=\frac{4+3+3+3+0+3+2}{7}=\frac{18}{7}=2.57$