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

Answer: (B)

Mean $(\bar{x})=\frac{42}{7}=6$
MD $(\bar{x})=\frac{\Sigma |x_i-\bar{x}|}{n}$
$=\frac{4+3+3+3+0+3+2}{7}=2.57$