Answer:
From the given graph above
No
It is a not a function
Function has only one output for each input
It does not pass the vertical line test
Eight hours a day is a healthy average
I am not that sure but I believe it would be 12 and 1/2 points since that would have brought him back up to 100%. Because if it was any other it would make his score lower than 100% or higher then 100%