For 12 10 9 7 7: var=4.5
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12
For 8 9 9 9 10 11 11 12: σ=1.3562
It is 12.
That is not true. It is possible for a data set to have a coefficient of determination to be 0.5 and none of the points to lies on the regression line.
There are 4 possible answers: (7, 7, 10, 13, 13) (7, 8, 10, 12, 13) (7, 9, 10, 11, 13) (8, 8, 10, 10 14).