Diketahui data: 90, 83, 88, 88, 89, 88, 89, 98. kuartil bawah dari data tersebut adalah . . . .
Data: 90, 83, 88, 88, 89, 88, 89, 98.
Urutan data: 83, 88, 88, 88, 89, 89, 90, 98
Banyak data: 8
[tex] \tt \:Q_1 = X_{\frac{1(8+1)}{4}}[/tex]
[tex] \tt \: Q_1 = X_{\frac{9}{4}}[/tex]
[tex] \tt \: Q_1 = X_{2.25}[/tex]
[tex] \tt \: \: \: \: \: \: \: = X_2 + 0.25 \times (X_3 - X_2)[/tex]
[tex] \tt \: \: \: \: \: \: \: = 88+ 0.25 \times (88 - 88)[/tex]
[tex]\tt \: \: \: \: \: \: \: =88 + 0.25 \times 0[/tex]
[tex]\tt \: \: \: \: \: \: \: =88[/tex]
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