Jawabanmu

2014-05-24T20:12:55+07:00
6+8+9+y+7+5+10 / 7 = 6,5 
45 + y / 7 = 6,5
45 + y = 6,5 x 7
45 + y = 45,5
y = 45,5 - 45
y = 0,5
2014-05-24T20:41:46+07:00
rata-rata =  \frac{6 + 8 + 9 + y + 7 + 5 + 10}{7} = 6,5
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=  45 + y = 6,5 . 7
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= 45 + y = 45,5
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= y = 0,5

jangkauan data dari 0.5, 5, 6, 7, 8, 9, 10 
= 10 - 0.5
= 9.5

semoga membantu^^