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rata - rata = 5 + 5 + 6 + 6 + 6 + 7 + 7 + 8 + 8 + 8
10
= 6,6
rata -rata panjanr gulungan bu indah adalah 6,6
no 36
11 x 7 = 77
12 x 7 = 84
13 x 5 = 65
14 x 1 = 14 +
240
7 + 7 + 5 + 1 = 20
rata - rata = 240
20
= 12
jadi rata rata umur siswa adalah 12 tahun
66:10=6,6 (C)
36. 11x7=77
12x7=84
13x5=65
14x1=14
77+84+65+14=240
7+7+5+1=20
240:20=12 tahun (a)