I agree that, to my mind, there is uncertainty as to what to take as the uncertainty!
When values are given to 0.5 (eg a measurement 6.5 cm) I'd assume it's to the nearest 0.5
Here, as it is given to 1 dp (ignoring POT), I'd assume it's to nearest 0.1, but I think it can be taken to plus/minus 0.05.
I expect your teacher can tell you the exam board's rules which you'll need to apply.
A thing that really bugs me is when uncertainty is quoted to lots of sf!