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= 54 : 8
= 6,75 (C)
2.) Mean = (5+4+6+6+x+7+7+8) : 8
6 = (43+x) : 8
6 x 8 = 43+x
48 = 43+x
x = 48 - 43
x = 5 (B)
= 54 : 8 = 6,75
2)6=5.1 + 4.1 + 6.2 + 7.2 + 8.1 + x : 8
= 5 + 4 + 12 + 14+ 8 + x : 8
= 43 + x : 8
x = 48-6.8
=48-43 = 5