The suffix is -ness and it indicates a quality or condition of the root word. In this instance, it would have the quality of quiet.
It is closest to 1/2 because 1/2 of 16/16 is 8/16
You need to give the document provided.
They are both not likely to be certain would be 100%, likely would be anywhere above 50%, and unlikely would be under 50%
That he's going to make a deal with Mr. Linder. -------Apex