Question

The mean deviation of the numbers 3, 4, 5, 6, 7 from the mean is

• A. 25
• B. 5
• C. 1.2
• D. 0

Answer 1

The correct option is C

1.2

Mean $\overline{X}=\frac{3+4+5+6+7}{5}=\frac{25}{5}=5$

Taking the absolute value of deviation of each term from the mean, we get :

$M.D=\frac{|(3-5)|+|(4-5)|+|(5-5)|+|(6-5)|+|(7-5)|}{5}=\frac{2+1+0+1+2}{5}=\frac{6}{5}=1.2$