It's 7 because the mean is the average. To find the average of something you add all the numbers up then take then answer divided by the number of how many numbers you added together.
(1) 8
(2) + 5
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13
(3) +2
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15
(4)+10
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25
(5)+10
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35
35 divided by 5 equals 7
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= 2/5-8/2 = (2/5)-(8/2) = (4/10)-(40/10) = -36/10 = -18/5 Or as a decimal, -3.6
4/5 isequal to 8/104/5 * 2/2 = 8/10
here are all the possible combinations 6(12)+8 6(10)+10(2) 6(9)+8(2)+10 6(8)+8(4) 6(7)+8+10(3) 6(6)+8(3)+10(2) 6(5)+8(5)+10 6(5)+10(5) 6(4)+8(2)+10(4) 6(4)+8(7) 6(3)+8(4)+10(3) 6(2)+8+10(6) 6(2)+8(6)+10(2) 6+8(3)+10(5) 6+8(8)+10 8(10) 8(5)+10(4) 10(8)
As a mixed number 2.8 is 2 and 8/10 or 2 and 4/5 simplified
2/5 + 8/5 = 10/5 = 2