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SMK Teknologi dan Rekayasa

Soal 110 Ukuran Penyebaran


Diketahui\ tinggi\ badan\ 11\ siswa\ (dalam\ cm)\ sebagai\ berikut:\\150,\ 148,\ 145,\ 152,\ 165,\ 152,\ 155,\ 168,\ 160,\ 155,\ 160.\\Simpangan\ kuartil\ dari\ data\ tersebut\ adalah\ ....\\a.\ \ 10\ \ \ \ \ \ \ \ \ \ b.\ \ 9\ \ \ \ \ \ \ \ \ \ c.\ \ 8\ \ \ \ \ \ \ \ \ \ d.\ \ 5\ \ \ \ \ \ \ \ \ \ e.\ \ 4,5
Jawaban: d

Data\ terurut:
145\ \ \ \ 148\ \ \ \ \mathbf{150}\ \ \ \ 152\ \ \ \ 152\ \ \ \ \mathbf{155}\ \ \ \ 155\ \ \ \ 160\ \ \ \ \mathbf{160}\ \ \ \ 165\ \ \ \ 168\\\begin{matrix} & & & & & & \end{matrix}\ \mathbf{Q_{1}}\begin{matrix} & & & & & & & & \end{matrix}\ \ \mathbf{Q_{2}}\begin{matrix} & & & & & & & & \end{matrix}\ \ \mathbf{Q_{3}}
\begin{array}{rcl}Q_{d}&=&\frac{1}{2}(Q_{3}-Q_{1})\\\\&=&\frac{1}{2}(160-150)\\\\&=&\frac{1}{2}\times 10\\\\&=&5\end{array}

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