## 3.26 Quartiles, Deciles, and Percentiles

$$Q_1= \frac{(n+1)}{4}th \space$$

$$Q_2, Q_3=?$$

Find $$Q_1, Q_2, Q_3$$

X = 4, 6, 7, 10, 12, 13, 14, 15, 16, 17, 19

• 4, 8.5, 13, 12.0909091, 15.5, 19
• What are the formulae for Deciles ($$D_i$$ and $$P_i$$)