I'm really having a tough time with this exercise and I don't even know where I am supposed to start from! Could you help me?

There were 1000 citizens in a small town. Because of a disease, 811 of them got vaccinated. However, 200 citizens died and 110 of them were vaccinated.

(a) Test if the vaccine prevents death significantly

(b) Test if the vaccine increases the probability of surviving by more than 30 percentage points.

thank you!