[estro]

Depends on which strain. Ebola Zaire is reported to kill with up to a 90% efficiency, while others more around 50%.

[TheSpiceIsLife]

Here's what the World Health Organisation has to say:

The average EVD case fatality rate is around 50%. Case fatality rates have varied from 25% to 90% in past outbreaks.

https://www.afro.who.int/health-topics/ebola-virus-disease

[Synaesthesia]

I think with aggressive treatment people have a higher chance of survival.