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frekuensi 4 6 12 7 6 2 1
mean = nilai rata rata
median = nilai rata tengah
modus = yang paling banyak jumlah/sering muncul
mean = (nilai dikali frekuensi) 4x4 + 5x6 + 6x12 + 7x7 + 8x6 + 9x2 + 10x1 (dibagi jumlah nilai/frekuensi) 4+6+12+7+6+2+1
= 16 + 30 + 72 + 49 + 48 + 18 +10 *dibagi* 4+6+12+7+6+2+1
= 243 / 38
= 6,4
median = jumlah angka + 1 : 2
= (7 + 1) : 2
= 8:2
= 4 *datum ke empat* yaitu 7
modus =- 6