Jawab:
8. Diketahui : X20 = 6,0
X30 = 7,0
Ditanya : X10 = ...?
Jawab :
X =
X20 = Σf20 / 20
Σf20 = X20 × 20
Σf20 = 6,0 × 20
Σf20 = 120,0
X30 = Σf30 / 30
Σf30 = X30 × 30
Σf30 = 7,0 × 30
Σf30 = 210,0
Σf10 = Σf30 - Σf20
= 210,0 - 120,0
= 90
X10 = Σf10 / 10
= 90/10
=9,0
Jadi, rata-rata nilai murid perempuan adalah 9,0
Note :
X = nilai rata-rata
Σf = total nilai
9.
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Jawab:
8. Diketahui : X20 = 6,0
X30 = 7,0
Ditanya : X10 = ...?
Jawab :
X =
X20 = Σf20 / 20
Σf20 = X20 × 20
Σf20 = 6,0 × 20
Σf20 = 120,0
X30 = Σf30 / 30
Σf30 = X30 × 30
Σf30 = 7,0 × 30
Σf30 = 210,0
Σf10 = Σf30 - Σf20
= 210,0 - 120,0
= 90
X10 = Σf10 / 10
= 90/10
=9,0
Jadi, rata-rata nilai murid perempuan adalah 9,0
Note :
X = nilai rata-rata
Σf = total nilai
9.