Answer:
Please see attached photo!
Step-by-step explanation:
Any 3-dimensional shape that has a polygon base and a consistent height.
For example: a cube, a rectangular prism. (Note: cylinder does not work due to non-polygon shape.)
The midpoint would be (-8.5,-3.5))
Prime numbers > than 5 are 7, 11, 13, 17, and 19 so 5/20, or 1/4, or 25% chance