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36)
Interval F Fk
121-123 2 2
124-126 5 7
127-129 10 17
130-132 12 29
133-135 8 37
136-138 3 40
Letak D₄=(4/10).40=16, yaitu pada data ke-16 pada interval 127-129
D₄=126,5+3((16-7)/10)
D₄=126,5+3(0,9)
D₄=126,5+2,7=129,2 (C)
37)
Tentukan dulu rata-rata:
(4+6+10+12+18) / 5=10
Sr=|4-10|+|6-10|+|10-10|+|12-10|+|18-10| / 5
Sr=6+4+0+2+8 / 5
Sr=20 / 5=4 (D)