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1/4 n = 1/4 x 60 = 15
Q1 = pada kelas ke 2
Btb = 13,5
fk = 8
fQ = 9
c = 3
Q1 = Btb + {(1/4 n - fk)/fQ }.c
Q1 = 13,5 + {15 - 8)/9}.3
Q1 = 13,5 + 7/3
Q1 = 13,5 + 2,33
Q1 = 15,83