why is that so ?
100% chance of something happening means it'll happen for sure 200% chance of something happening is just meaningless It's not a convention The chances of something happening can logically only lie in the range [0%,100%], NO CONVENTION here and by [0%,100%] it is implied that it's [0.0,1.0] since `per-cent` means `per-100` means how many out of hundred