Not sure but I think she has 1 31/35 yards of ribbon.
100% of the rolls would be less than 13. The highest number on one die is 6, so even if you roll 2 dice the sum of both dice will always be lower than 13.
It's a 1:1 probablility.
A line segment is defined as the set of numbers that is contained in a line between the two endpoints.
