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median 28 berarti Q1= 25 Q3= 30 JIK=Q3-Q1 = 30-25=5
b) 145,148,149,150,151,151,152,153,156
median 151 berarti Q1= 148+149/2=148,5 Q3=152+153/2=152,5 JIK=Q3-Q1= 152.5-148,5=4