The instructions say that the score is always in between the lowest and the highest score. For consistency, we take the middle point between the lowest and the highest.
Here are the answers:
a. (4 + 5) / 2 = 4.5
b. (0.325 + 0.35) / 2 = 0.338
c. (0.35 + 0.375) / 2 = 0.362
d. (0.2 + 0.225) / 2 = 0.213
e. (3.5 / 2) = 1.75