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65 2
70 6
75 7
80 5
85 4
90 4
95 2
b)yang mndapat nilai di bawah 80 = 2+6+7=15
a.nilai frekuensi
65 2
70 6
75 7
80 5
85 4
90 4
95 2
b.jumlah nilai di bawah 80 ada 15 [ 2 + 6 + 7]
terima kasih semoga membantu ^_^