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Data setelah diurutkan4 5 6 7 7 9 10 12 14
banyak data n= 9
a.
letak kuartil bawah =1/4(n+1) =1/4(9+1) = 2,5
Nilai kuartil bawah = 5 +0,5(6-5) = 5 +0,5 = 5,5
b.
letak kuartil atas = 3/4 (n+1) =3/4 (9+1) = 7,5
nilai kuartil atas = 10 + 0,5(12-10) = 10 +0,5 .2 = 10 + 1 = 11