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rata2 12 siswa = 7
berapa nilai rata2 4 siswa??
jawab
8 x 6,5 = 52
12 x 7 = 84
jumlah rata2 12 siswa - umlah rata2 8 siswa = .............
= 84-52
= 32
32 : 4 siswa = 8
jadi nilai rata2 4 siswa adl 8
maka 12 x 7 = 84
8 x 6.5 = 52
maka rata - rata 4 siswa = = 8