Dublin pilot,
if we were talking purely from a mathematics point of view, then the answer to your conundrum would have been the higher value. As 0-4 accounts for the lower half of the value, ergo 5-9 accounts for the upper half of the value. But in the real world the wind would be doing well to be within 10 deg tolerance, so a question of that sort just makes a joke of any pretence of serious examination to establish the competancy of the candidate to navigate!
Hope that helps!
P.B