Answer:
it is 5 if im not mistaken
Given function is

At t= 79.5 degree.
So we can place t= 79.5 in given equation

=

=

=

So elevation equal to 625 meter at t = 79.5 degree.
I don't think It is 72,
most likely, its 21....?
(also sorry for before, lol)
7 2/3 + 8 5/6 = 7 4/6 + 8 5/6
7+8=15 4/6 + 5/6 = 1 3/6
15 3/6 simplified is 15 1/2
True, a uniform distribution usually means they will be around the same frequency