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Here is a table of all possible outcomes of sums, count those that
are 7 or less. There are 36 possible outcomes so that will be the
denominator.
Die_1 1 2 3 4 5 6
Die_2
1 2 3 4 5 6 7
2 3 4 5 6 7 8
3 4 5 6 7 8 9
4 5 6 7 8 9 10
5 6 7 8 9 10 11
6 7 8 9 10 11 12
21/36 =
or approx. 0.583 (58.3%)