Where you have just two numbers then the halfway point is also the average or arithmetic mean.
Just add the numbers together and divide by 2.
1.1 + 1.2 = 2.3
2.3 ÷ 2 = 1.15
1/20
1.15
0.34
No.
10.95
It is 15
41.5
(0 + 12)/2 = 6 this is different from halfway between 1 & 12 because of starting the range at 0
15
15
11
13
It is 13
11 AM
It is: (-12+10)/2 = -1