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banyak data = 6 data
rata-rata= jumlah data / banyak data = 475 /6 = 79,16
rumus rata-rata = ------------------
banyak data
mak
75 + 73 + 76 + 77 + 86 + 88 475
rata-ratanya = --------------------------------------- = -------- = 79,2
6 6