Chapter 22

Number 1 2 3 4 5 6 7 8 9 10 Frequency 1 0 1 2 3 2 1 2 2 1 $\hspace{0.17em}\sum \hspace{0.17em}f}\hspace{0.17em}=\hspace{0.17em}15$
Median is eighth number; $\text{median}\hspace{0.17em}=\hspace{0.17em}6.$
3. 5 appears three times, and no other number appears more than twice; $\text{mode}\hspace{0.17em}=\hspace{0.17em}5.$

Number 1–3 3–5 5–7 7–9 9–11 Frequency 1 3 5 3 3 (left endpoint included)

Stem Leaf 7 2 9 8 2 5 7 9 1 4 4 6 10 7 6. Let $t\hspace{0.17em}=\hspace{0.17em}\text{thickness}$
$\begin{array}{rcl}\stackrel{\hspace{0.17em}\xaf\hspace{0.17em}}{t}& \hspace{0.17em}=\hspace{0.17em}& {\displaystyle \frac{3(0.90)\hspace{0.17em}+\hspace{0.17em}9(0.91)\hspace{0.17em}+\hspace{0.17em}31(0.92)\hspace{0.17em}+\hspace{0.17em}38(0.93)\hspace{0.17em}+\hspace{0.17em}12(0.94)\hspace{0.17em}+\hspace{0.17em}5(0.95)\hspace{0.17em}+\hspace{0.17em}2(0.96)}{3\hspace{0.17em}+\hspace{0.17em}9\hspace{0.17em}+\hspace{0.17em}31\hspace{0.17em}+\hspace{0.17em}38\hspace{0.17em}+\hspace{0.17em}12\hspace{0.17em}+\hspace{0.17em}5\hspace{0.17em}+\hspace{0.17em}2}}\\ \hspace{0.17em}=\hspace{0.17em}& {\displaystyle \frac{92.7}{100}}\hspace{0.17em}=\hspace{0.17em}0.927\text{in}\hspace{0.17em}.\hspace{0.17em}\end{array}$
7. Using 1Var stats with thicknesses ...
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