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Verified answer
Q1=16Q3=21
Qd=1/2(21-16)
= 5
n data = 13
urutan data
15,15,16,16,17, 19, 20, 22, 25, 29, 29, 32,32
............Q1...................Q2............(Q3)
Q1= 1/2 (16+16) = 16
Q3 = 1/2 (29+29) = 29
Simpangan kuartil = 1/2 (Q3 - Q1) = 1/2 (29-16) = 6,5