13.2 Mean Deviation (M.D.)

Calculate Mean ($\bar{x}$): $\bar{x} = \frac{6+7+10+12+13+4+8+12}{8} = \frac{72}{8} = 9$

Calculate Absolute Deviations $|x_i - 9|$:

• $|6-9| = 3$
• $|7-9| = 2$
• $|10-9| = 1$
• $|12-9| = 3$
• $|13-9| = 4$
• $|4-9| = 5$
• $|8-9| = 1$
• $|12-9| = 3$

Sum of Deviations: $3+2+1+3+4+5+1+3 = 22$.

Calculate M.D.: $M.D.(\bar{x}) = \frac{22}{8} = 2.75$