Jawabanmu

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2014-04-16T18:46:13+07:00
(6+6+6+7+7+7+8+8+2x+3)/10 = 6,8
(58+2x)/10 = 6,8
58+2x = 68
2x = 10
x = 5 
1 5 1
2014-04-16T18:52:20+07:00
6.80*10(jumlah data) = 68 68=55+ (2x+3) 68=58+2x 68-58=2x 10=2x x=5